Class / Patent application number | Description | Number of patent applications / Date published |
330302000 | Including frequency-responsive means in the signal transmission path | 82 |
20080211586 | DUAL INPUT LOW NOISE AMPLIFIER FOR MULTI-BAND OPERATION - A dual input low noise amplifier (LNA) for multi-band frequency operation is disclosed. The dual input LNA ( | 09-04-2008 |
20080211587 | Method and Apparatus for Increasing the Efficiency of Low Power Amplifier - The present invention is directed to a method for reducing the current consumption and increasing the efficiency of an RF power amplifier (PA), while maintaining the output power. The desired output power of the PA is determined and for each level of the desired output power, the load that is connected to the output stage of the PA is tuned to essentially match the output impedance of the output stage to provide maximal gain. By doing so, the dynamic RF load line has a slope that causes it to intersect with the drain-source (or emitter-collector, in case of a bipolar transistor) voltage, across the output stage, at a value that corresponds to the voltage swing required to provide the desired output power. | 09-04-2008 |
20080231373 | Output Circuit - One embodiment of the invention provides an output circuit for a transistor. The output circuit includes a first capacitor coupled between ground and a drain electrode of the transistor via a first bond wire and a second bond wire coupling which couples a node between said first bond wire coupling and said first capacitor with ground via a second capacitor. | 09-25-2008 |
20080252382 | CLASS-F POWER AMPLIFIER CIRCUIT - An FET outputs a signal including a component of angular frequency ωo of input signal and harmonic components, a first two-terminal reactance circuit interconnects an output terminal and a ground terminal of the FET, a fundamental matching circuit is connected to an output terminal end of the FET, a second two-terminal reactance circuit is connected between an input terminal of the matching circuit and the output terminal, the FET has a parallel circuit of an output resistor and an output capacitor, the first two-terminal reactance circuit is open for a dc, shorted for angular frequencies 2ωo, 4ωo, . . . 2nωo, and parallel resonant with the output capacitor for angular frequencies 3ωo, 5ωo, . . . , (2n+1)ωo, and the second two-terminal reactance circuit is shorted for a dc, and open for angular frequencies 3ωo, 5ωo, . . . , (2n+1)ωo. | 10-16-2008 |
20090033426 | PRE-EMPHASIS CIRCUIT - An amplifier stage or circuit for providing pre-emphasis. The circuit includes a first input node configured to receive a first data signal and a second input node configured to receive a second data. The circuit also includes an adjustable delay stage configured to at least partially produce a delay in the first and/or second data signals to thereby generate a first delayed signal and/or second delayed signal. The circuit additionally includes a pulse generation stage configured to generate a first pulse signal from the first delayed signal and the first data signal and/or produce a second pulse signal from the second delayed signal and the second data signal. The circuit further includes a first output node configured to output the first pulse signal and a second output node configured to output the second pulse signal. | 02-05-2009 |
20090058534 | Non-inverting amplifier circuit and optical switch driver circuit - A non-inverting amplifier circuit is disclosed that includes an operational amplifier and a preemphasis circuit connected between the operational amplifier and a signal source. The preemphasis circuit is configured to compensate for the internal delay of a load connected to the output of the operational amplifier by emphasizing a high-frequency component of a signal fed from the signal source. | 03-05-2009 |
20090085670 | MULTIBAND OUTPUT IMPEDANCE MATCHING CIRCUIT HAVING PASSIVE DEVICES, AMPLIFIER INCLUDING MULTIBAND INPUT IMPEDANCE MATCHING CIRCUIT HAVING PASSIVE DEVICES, AND AMPLIFIER INCLUDING MULTIBAND INPUT/OUTPUT IMPEDANCE MATCHING CIRCUIT HAVING PASSIVE DEVICES - Disclosed are a multiband output impedance matching circuit having passive devices, an amplifier including a multiband input impedance matching circuit having passive devices, and an amplifier including a multiband input/output impedance matching circuit having passive devices, which can be miniaturized without a separate output terminal buffer and reduce current consumption by using the passive devices. | 04-02-2009 |
20090085671 | LOAD INDUCTOR SHARING - Sharing one or more load inductors comprises receiving a first input signal at a first terminal of a first amplifier and amplifying the first input signal using the first amplifier. The first amplifier is coupled to one or more load inductors at a second terminal of the first amplifier and is coupled to one or more dedicated source inductors at a third terminal of the first amplifier. Also, a second input signal is received at a first terminal of a second amplifier amplifying the second input signal using the second amplifier. The second amplifier is coupled to the one or more load inductors at a second terminal of the second amplifier and is coupled to one or more dedicated source inductors at a third terminal of the second amplifier. | 04-02-2009 |
20090134941 | Negative Resistance Input Amplifier Circuit and Oscillation Circuit - The present invention provides a negative resistance input amplifier including: a microstrip line having one end connected to a collector of a transistor and the other end being open with a length of ¼ of a wavelength λ at a predetermined frequency f; and a microstrip line having one end connected to an emitter of the transistor and the other end grounded with a length of ¼ of the wavelength λ at the predetermined frequency f so that impedance viewed from a base of the transistor becomes negative only at around a target frequency, and an oscillator using the negative resistance input amplifier. | 05-28-2009 |
20090167439 | AMPLIFIER AND THE METHOD THEREOF - An amplifier amplifying an input signal and the method thereof. The amplifier comprises an impedance matching network and a transconductor amplifier. The impedance matching network receives the input signal to perform impedance matching thereon, and comprises a first resistor, a first transistor, and a second resistor. The first resistor, receives the input signal to generate a matched signal. The first transistor coupled to the first resistor, has a channel thermal noise to establish a first noise voltage. The second resistor coupled to the first resistor and transistor, receives the channel thermal noise to establish a second noise voltage. The transconductor amplifier coupled to the impedance matching network, comprises first and second transconductor circuits. The first transconductor circuit with first transconductance, coupled to the first resistor and transistor, receives the first noise voltage to generate a first noise current. The second transconductor circuit with second transconductance, coupled in parallel to the first transconductor circuit and in series to the load, receives the second noise voltage to generate a second noise current such that the first and second noise currents cancel each other out to reduce a noise component in the output current to the load when summing up together. The first and second transconductance have the opposite signs. | 07-02-2009 |
20090179705 | IMPEDANCE-MAPPING AMPLIFIER CIRCUIT WITH EXCLUSIVELY REACTIVE NEGATIVE FEEDBACK - An amplifier circuit has a transistor element that has an input terminal, an output terminal) and a third terminal. An input signal to be amplified is supplied to the input terminal. The amplified input signal is emitted as an output signal at the output terminal. The input terminal is connected with the output terminal via a first reactance. The third terminal is connected via a second reactance with a zero potential. One of the reactances is fashioned as an inductor and the other of the reactances is fashioned as a capacitor. An inductance value of the inductor and a capacitance value of the capacitor are dimensioned such that the quotient of the inductance value of the inductor and the capacitance value of the capacitor is equal to the product of a desired input impedance that is effective at the input terminal and an output impedance associated with the output impedance. Based on this dimensioning, the output impedance associated with the output terminal is mapped to the input terminal at the same level or scaled. | 07-16-2009 |
20090189696 | LOW-NOISE AMPLIFIER - A low-noise amplifier is provided according to the present invention. The low-noise amplifier includes a first amplifier stage, a second amplifier stage, a third amplifier stage, an input matching network, inter-stage matching networks, and an output matching network. The impedance of the input matching network and the input impedance of the first amplifier stage are conjugate matched, thereby decreasing system power consumption and noise factor. The system gain is enhanced by cascading three stages of amplifiers. | 07-30-2009 |
20090237167 | Integrated Amplifier Circuit - An integrated amplifier circuit includes an input, an output, a transistor with a transistor-input terminal, the transistor-input terminal being coupled to the input, and a transistor-output terminal. The transistor-output terminal is coupled to the output by means of a DC-path. The DC-path includes a first inductive element and a parallel resonant circuit including a second inductive element and a first capacitive element. The first inductive element and the parallel resonant circuit are connected in series between the transistor-output terminal and the output. | 09-24-2009 |
20100007424 | METHOD OF ACHIEVING HIGH SELECTIVITY IN RECEIVER RF FRONT-ENDS - According to some embodiments, an apparatus may comprise an amplifier, wherein the amplifier comprises: an output stage formed of a positive output terminal providing a positive output voltage and a negative output terminal providing a negative output voltage; a load tank coupled in parallel with the output stage and configured to filter signals received at the amplifier; and a negative resistance block coupled in parallel with the output stage and the load tank. | 01-14-2010 |
20100026393 | DRIVER AMPLIFIER HAVING A PROGRAMMABLE OUTPUT IMPEDANCE ADJUSTMENT CIRCUIT - A driver amplifier in an integrated circuit is suitable for driving a signal onto an output node and through an output terminal, and through a matching network to a power amplifier. A novel Programmable Output Impedance Adjustment Circuit (POIAC) within the integrated circuit is coupled to the output node and affects an output impedance looking into the output terminal. When the output impedance would otherwise change (for example, due to a driver amplifier power gain change), the POIAC adjusts how it loads the output node such that the output impedance remains substantially constant. The POIAC uses a series-connected inductor and capacitor L-C-R circuit to load the output node, thereby reducing the amount of capacitance and die area required to perform multi-band impedance matching with a power amplifier. Multi-band operation is accomplished by changing an effective capacitance in the L-C-R circuit depending on communication band information received by the POIAC. | 02-04-2010 |
20100109783 | Reconfigurable Amplifier and Filter Using Time-Varying Circuits - A reconfigurable system is used for amplifying, filtering, and sampling analog signals. Unlike conventional analog filters and amplifiers based on linear time-invariant systems and classical filter responses such as Butterworth or Chebyshev filters, the system described here uses parallel branches comprising time-varying circuits. An input voltage or current is communicated to a number of parallel branches and each branch processes a segment of the input signal using time-varying circuits such as analog multipliers and/or super-regenerative amplifiers. The time-window of the input signal processed by each branch is equal in length, but offset in time from all other branches. The output of each branch is a series of filtered and amplified samples of the input signal. The output samples of all branches are then time-interleaved in the analog domain, or digitized using separate analog-to-digital converters and then time-interleaved digitally. By using time-varying circuits, sharper filters and greater amplification is achieved while consuming less integrated-circuit area and power. The time-varying circuits in each branch are controlled by synthesized signals that determine the filter response and gain of the overall system. As a result, better flexibility and reconfigurability are achieved compared with classical filters and amplifiers. | 05-06-2010 |
20100201450 | CONTROLLING AMPLIFIER INPUT IMPEDANCE - An amplifier ( | 08-12-2010 |
20110050350 | AMPLIFIER CIRCUIT - An amplifier circuit operating at a fundamental angular frequency • | 03-03-2011 |
20110140787 | METHOD AND SYSTEM FOR AMPLIFYING A SIGNAL USING A TRANSFORMER MATCHED TRANSISTOR - A power amplifier includes a transistor, a transmission line transformer, and a capacitor. The transistor is operable to receive a signal and to generate an amplified signal. The transistor has a source, a drain, and a gate. The gate has a first impedance and is operable to receive the signal to be amplified. The transmission line transformer has a first, second, third, and fourth port, the first port and the third port being coupled directly to the gate of the transistor, and the fourth port being coupled to a source device having a second impedance. The capacitor has a first end and a second end. The first end of the capacitor is coupled to the second port of the transmission line transformer and the second end is coupled to a ground. | 06-16-2011 |
20110163814 | Hybrid Class Amplifier - A power amplifier ( | 07-07-2011 |
20120092076 | PACKAGE-BASED FILTERING AND MATCHING SOLUTIONS - A microelectronic package having a radio frequency (RF) amplifier circuit and, incorporating harmonic rejection filters and matching circuits integrally formed in the package is disclosed. A harmonic rejection filter may comprise a metal-insulator-metal (MIM) capacitor serially coupled between bond pads disposed on a RF amplifier circuit die, a first wire bond coupling a first bond pad to a package output, where the first bond pad is coupled to the output of the RF amplifier, and a second wire bond coupling a second bond pad to a package ground. The harmonic rejection filter may be appropriately configured to filter one or more harmonics at different frequencies. | 04-19-2012 |
20120161879 | TECHNIQUES TO IMPROVE THE STRESS ISSUE IN CASCODE POWER AMPLIFIER DESIGN - An amplifier includes a first transistor, and a first inductor disposed between the first transistor and a voltage source. A first output node is between the first transistor and the first inductor. The amplifier further includes a second inductor disposed between the first transistor and ground. The amplifier further includes a second transistor, and a third inductor disposed between the second transistor and a ground. A second output node is between the second transistor and the third inductor. The amplifier further includes a fourth inductor disposed between the second transistor and the voltage source. The amplifier further includes a first capacitor disposed between the first output node and the second output node, and a second capacitor disposed between a first mid-node, which is between the first transistor and the first inductor, and a second mid-node, which is between the second transistor and fourth inductor. | 06-28-2012 |
20120280753 | SYSTEM AND METHOD FOR ADJUSTING GAIN FREQUENCY RESPONSE OF RF POWER AMPLIFIER - A radio frequency (RF) amplifier is disclosed including an active device adapted to amplify an input signal in accordance with a gain frequency response to generate an output signal, and a dissipative circuit adapted to modify the gain frequency response by dissipating the input or output signal more so at a first frequency range than at a second frequency range. The dissipative circuit may include a resistive element, and an open circuit adapted to operate as an open at a specified frequency to substantially minimize the dissipation of the input or output signal through the resistive element at the specified frequency. The open circuit may include an open-ended transmission line having an electrical length of a half wavelength or multiple thereof at the specified frequency. Alternatively, the open circuit may include a short-ended transmission line having an electrical length of a quarter wavelength or odd multiple thereof at the specified frequency. | 11-08-2012 |
20120280754 | POWER AMPLIFIER WITH CO-EXISTENCE FILTER - A power amplifier architecture and front end circuits utilizing the same that connect a transceiver to an antenna are disclosed. The transceiver is configured for a specific operating frequency. An input matching segment is connected to an input port, and an output matching segment is connected to an output port. An amplifier segment includes at least one transistor with a first terminal connected to the input matching segment, a second terminal connected to the output matching segment, and a third terminal connected to a filter with a range of rejection frequencies. The filter is connected in close proximity to a first inductive interconnection tying a junction connected to the third terminal to a ground. A compensator is also connected to the input matching segment and the output matching segment to minimize instability of the filter. | 11-08-2012 |
20120293268 | Narrowband amplifier with improved interference suppression - A radio signal is input to a first terminal and output after amplification at a second terminal. There is a third terminal which is common to both the first and the second terminal. There is an inductance interfacing the second terminal to a direct current power supply; and a radio frequency filter connected in shunt with the inductance. In an exemplary embodiment the first, second and third terminals are respective base, collector and emitter terminals of a bipolar transistor. Such a bipolar transistor is characterized in that voltage from the power supply passes to the second terminal through the inductance but not through the radio frequency filter; and the signal output passes from the second terminal through the radio frequency filter but not through the inductance. The illustrated embodiments show the radio frequency filter as a surface acoustic wave filter in direct connection with the second terminal. | 11-22-2012 |
20130106519 | RADIO FREQUENCY AMPLIFIER CIRCUIT | 05-02-2013 |
20130106520 | HYBRID CLASS AMPLIFIER | 05-02-2013 |
20130113571 | ANTENNA LNA FILTER FOR GNSS DEVICES - A low-noise amplifier (LNA) filter for use with global navigation satellite system (GNSS) devices is disclosed. A first LNA stage, which is configured to connect to an antenna configured to receive GNSS signals, includes an LNA. A second LNA stage, which is connected to the output of the first LNA stage, has a surface acoustic wave (SAW) filter and an LNA. A third LNA stage, which is connected to the output of the second LNA stage, also has a SAW filter and an LNA. | 05-09-2013 |
20130176079 | RADIO FREQUENCY POWER AMPLIFIER - A radio frequency power amplifier includes: an amplifying element which amplifies an input signal and outputs the signal from an output terminal; and an output load circuit which includes a first resonant circuit and a second resonant circuit that are connected to the output terminal. The first resonant circuit has a resonance frequency higher than the frequency of the second harmonic of the input signal, and the second resonant circuit has a resonance frequency lower than the frequency of the third harmonic of the input signal. The output load circuit has such an impedance looking from the output terminal that a phase of a reflection coefficient at the second harmonic of the input signal is greater than 180 degrees and less than 360 degrees, and a phase of a reflection coefficient at the third harmonic of the input signal is greater than 0 degrees and less than 180 degrees. | 07-11-2013 |
20130194042 | Multi-Stage Amplifier Using Tunable Transmission Lines and Frequency Response Calibration of Same - A multi-stage amplifier is provided that uses tunable transmission lines, as well as a calibration method for the multi-stage amplifiers. A multi-stage amplifier, comprises a plurality of tunable amplification stages, wherein each of the tunable amplification stages comprises a tunable resonator based on a transmission line having a tunable element. The tunable elements may vary a capacitance or an inductance to tune a frequency of an applied signal. A calibration method is provided for a multi-stage amplifier having a plurality of transmission lines, an input stage and an output stage. The multi-stage amplifier is calibrated by generating a signal to determine a frequency for a substantially maximum power; generating an error signal by comparing the frequency for the substantially maximum power with a desired frequency; varying a digital control code applied to each of the tunable transmission lines, input stage and output stage until the error signal satisfies predefined criteria. | 08-01-2013 |
20140132356 | POWER AMPLIFIER AND POWER TRANSMISSION APPARATUS - According to an embodiment, a power amplifier includes a variable passive element and a comparator. The variable passive element is connected directly or indirectly to a first terminal of a switch element and serves to increase or reduce a resonant frequency of the amplifier. The comparator compares a voltage of interest with a reference voltage and outputs a control voltage for the variable passive element based on a difference between the voltage of interest and the reference voltage. | 05-15-2014 |
20140167863 | RF POWER TRANSISTOR CIRCUITS - A radio frequency (RF) power transistor circuit includes a power transistor and a decoupling circuit. The power transistor has a control electrode coupled to an input terminal for receiving an RF input signal, a first current electrode for providing an RF output signal at an output terminal, and a second current electrode coupled to a voltage reference. The decoupling circuit includes a first inductive element, a first resistor, and a first capacitor coupled together in series between the first current electrode of the power transistor and the voltage reference. The decoupling circuit is for dampening a resonance at a frequency lower than an RF frequency. | 06-19-2014 |
20140191809 | RADIO FREQUENCY AMPLIFIER CIRCUIT - A radio frequency amplifier circuit includes a transistor and an output-side matching circuit. The output-side matching circuit includes a first distributed constant line to which a radio frequency signal from the transistor is transmitted, a flat plate lead terminal transmitting the radio frequency signal from the first distributed constant line to an outside of the package, and a capacitive element having one electrode that is connected to the lead terminal and the other electrode that is grounded. A back surface of the lead terminal is joined to a resin substrate, and the capacitive element and the first distributed constant line are disposed adjacent to each other, with an alignment direction of the capacitive element and the first distributed constant line intersecting an alignment direction of the first distributed constant line and the lead terminal. | 07-10-2014 |
20140240052 | High Efficiency Power Amplifiers with Advanced Power Solutions - A device comprises a switch network having a plurality of switch cells connected in series, wherein each switch cell has a plurality of input voltages, and a plurality of switches, wherein each switch is coupled to an input voltage, and wherein the switch network is configured such that a different output voltage is produced in response to a different configuration, an output voltage with an output capacitance, and an impedance network coupled between the switch network and an output voltage port. | 08-28-2014 |
20140333385 | DUAL-BAND SEMICONDUCTOR RF AMPLIFIER DEVICE - There is described a dual-band semiconductor RF amplifier device. The device comprises (a) a transistor ( | 11-13-2014 |
20150008984 | Circulator Power Amplifier Circuit And Design Method Therefor - The present invention provides a circulator power amplifier circuit and a connection method thereof. Wherein, the circulator power amplifier circuit includes a power amplifier, a circulator, a power load and a load. An output end of the power amplifier is connected to an input end of the circulator, the load is connected to an output end of the circulator and the power load is connected to the load end of the circulator, wherein, the circulator is an N-stage circulator or an M-port circulator, where both N and M are integers greater than one. The above circulator power amplifier circuit connected through using the circulator power amplifier circuit connection method increases the isolation for the circulator, and it is of great significance in terms of improving a standing wave of the power amplifier, ensuring stability of specification, preventing mismatch damages of the power amplifier and increasing reliability of the power amplifier. | 01-08-2015 |
20150028955 | RF POWER DEVICE - In RF power transistors, the current distribution along edges of the transistor die may be uneven leading to a loss in efficiency and in the output power obtained, resulting in degradation in performance. When multiple parallel dies are placed in a package, distribution effects along the vertical dimension of the dies are more pronounced. A RF power device ( | 01-29-2015 |
20150091656 | Methods and Devices for Impedance Matching in Power Amplifier Circuits - Methods of turning on and/or turning off amplifier segments in a scalable periphery amplifier architecture are described in the present disclosure. The turning on and/or turning off the amplifier segments according to the various embodiments of the present can reduce spectral splatter in adjacent channels. In some embodiments, amplifier performance and efficiency can be improved by dissipating heat more uniformly. | 04-02-2015 |
20150091657 | Methods and Devices for Thermal Control in Power Amplifier Circuits - Methods of turning on and/or turning off amplifier segments in a scalable periphery amplifier architecture are described in the present disclosure. The turning on and/or turning off the amplifier segments according to the various embodiments of the present can reduce spectral splatter in adjacent channels. In some embodiments, amplifier performance and efficiency can be improved by dissipating heat more uniformly. | 04-02-2015 |
20150137894 | RF POWER AMPLIFIER AND OPERATING METHOD THEREOF - A multiband RF power amplifier includes a first band RF amplifier circuit, a second band RF amplifier circuit and a second band power detection circuit. The second band RF amplifier circuit subjects an RF input signal having a frequency band to power amplification and generates an RF amplifier output signal. The input terminal of the second band power detection circuit is coupled to the output of the second band RF amplifier circuit. The second band power detection circuit detects a harmonic component that is a whole number multiple of a fundamental wave component of the RF amplifier output signal, and generates a detected signal indicating the fundamental wave component. The second band power detection circuit includes an input circuit, which detects the harmonic component, and an output circuit, which generates the detected signal. | 05-21-2015 |
20180026592 | IMPEDANCE TRANSFORMATION CIRCUIT AND OVERLOAD PROTECTION FOR LOW NOISE AMPLIFIER | 01-25-2018 |
330303000 | Including an active device in the filter means | 4 |
20090289722 | Bonded Wafer Package Module - Bonded wafer packages having first and second wafers bonded together forming a matrix of sealed devices, at least one of the wafers having a plurality of passive devices formed thereon, including at least one BAW resonator within each of the sealed devices, the first wafer having conductor filled through-holes forming electrical connections between the passive devices and connections assessable from outside the sealed devices, the bonded wafers being diced to form individual sealed devices. The devices may be duplexers, interstage filters or other circuits such as VCOs and RF circuits. Various embodiments are disclosed. | 11-26-2009 |
20140132357 | Broadband Distributed Transmission Line N-Path Filter - In an embodiment, a single-ended transmission line N-path filter includes one or more filter stages, each stage having a first series inductive element, a shunt N-path filter, and a second series inductive element; an input port; and an output port. | 05-15-2014 |
20140312979 | AMPLIFYING CIRCUIT INCLUDING ACTIVE INDUCTOR - An amplifying circuit includes a first transistor configured to convert an input voltage signal to a current signal, a second transistor configured to convert the current signal to an output voltage signal, and a variable active inductor in which resistors and a switch are arranged between a gate and a drain of the second transistor. The amplifying circuit further includes a third transistor configured to draw a current and connected in parallel to the first transistor and a bias circuit configured to control individually a current flowing through the first transistor and a current flowing through the third transistor. | 10-23-2014 |
20160072456 | DUAL-BAND LOW NOISE AMPLIFIER - An apparatus includes amplification circuitry configured to amplify a radio frequency (RF) signal. The apparatus also includes differential inductors coupled to an output of the amplification circuitry. The differential inductors include a first inductor serially coupled to a second inductor, and the differential inductors are configured to filter the RF signal and to provide a differential output. | 03-10-2016 |
330304000 | And equalizing means | 4 |
20090002076 | SIGNAL WAVEFORM EQUALIZER CIRCUIT AND RECEIVER CIRCUIT - A signal waveform equalizer circuit capable of equalizing the waveform of an input signal with a center voltage of 0 V and yet small in circuit scale. An input signal (in | 01-01-2009 |
20090315626 | High Sensitivity Optical Receiver Employing a High Gain Amplifier and an Equalizing Circuit - An optical receiver includes a light receiving element for converting an optical signal to an electrical signal having a first bandwidth and an amplifier for amplifying the electrical signal. The amplifier has a first gain response that yields a second bandwidth that is less than the first bandwidth. The optical receiver also includes an equalizing circuit operationally coupled to the amplifier. The equalizing circuit has a second gain response that compensates for the first gain response of the amplifier so that a substantially constant net gain is imparted by the amplifier and the equalizing circuit to the electrical signal over the first bandwidth. | 12-24-2009 |
20110169574 | EQUALIZATION SYSTEM WITH STABILIZED PEAKING GAIN FOR A COMMUNICATION SYSTEM - An equalization system ( | 07-14-2011 |
20130187717 | RECEIVER EQUALIZATION CIRCUIT - A receiver equalization circuit includes a first output transistor having a gate coupled to an input signal. The receiver equalization circuit may also include a second output transistor having a drain coupled to a drain of the first output transistor. The receiver equalization circuit may also include a resistor coupled between a gate and a drain of the second output transistor to provide a direct current (DC) bias to the gate of the second output transistor. The receiver equalization circuit may further include a feed-through capacitor coupled between the gate of the second output transistor and an input signal source. The feed-through capacitor feeds the input signal to the gate of the second output transistor when a frequency of the input signal is above a predetermined threshold. The feed-through capacitor and the resistor define a signal gain amplification point. | 07-25-2013 |
330305000 | And tuning means | 10 |
20080297261 | Circuits and Methods for Implementing Transformer-Coupled Amplifiers at Millimeter Wave Frequencies - Circuits and methods are provided for building integrated transformer-coupled amplifiers with on-chip transformers that are designed to resonate or otherwise tune parasitic capacitances to achieve frequency tuning of amplifiers at millimeter wave operating frequencies. | 12-04-2008 |
20090002077 | Monolithic flexible power amplifier using integrated tunable matching networks - A flexible power amplifier can be adapted during operation for use in connection with two or more different wireless standards. In at least one embodiment, adaptations to power transistor size, RF bias current, and matching are made when a corresponding multi-standard wireless device changes the wireless standard under which it is currently operating. | 01-01-2009 |
20090039964 | LOW-NOISE AMPLIFIER CIRCUIT AND RECEIVING SYSTEM - In a broadband low-noise amplifier circuit to be used in a multichannel reception system, a capacitance of a variable capacitor ( | 02-12-2009 |
20090051441 | LOW-NOISE AMPLIFIER - Methods and corresponding systems in a low noise amplifier include selecting a selected sub-band for amplifying, wherein the selected sub-band is one of a plurality of sub-bands, wherein each sub-band is a portion of a frequency band, and wherein each sub-band has a corresponding sub-band center frequency. Next, a gate-source capacitor is adjusted so that a real part of an LNA input impedance corresponds to a real part of a source impedance at the selected sub-band center frequency. A match capacitor is also adjusted so that the LNA input impedance corresponds to the complex conjugate of the source impedance at the selected sub-band center frequency. The gate-source capacitor and the match capacitor can each be adjusted by recalling capacitor values from memory that correspond to the selected sub-band, and connecting selected capacitor components in response to the recalled capacitor values. | 02-26-2009 |
20090096533 | ADAPTIVELY TUNED RF POWER AMPLIFIER - An adaptively tuned RF power amplifier includes at least one power amplifier stage that has one or more active elements. A tunable output network is coupled to the power amplifier stage and includes one or more adjustable reactive elements. A mismatch detector detects a tuning mismatch based, at least in part, on one or more signals present within the tunable output network, and supplies one or more mismatch signals indicative of a detected tuning mismatch. A tuning controller, responsive to the one or more mismatch signals, controls one or more of the one or more adjustable reactive elements in the tunable output network so as to control the detected mismatch. | 04-16-2009 |
20090189697 | AUTO-TUNING AMPLIFIER - This document discloses, among other things, a front end circuit having a selectable center frequency. The center frequency is selected based on a control signal proportional to a phase difference between a reference frequency and an amplifier output. A resonant frequency of a tank circuit coupled to the amplifier is tuned using the control signal. | 07-30-2009 |
20090206935 | Reconfigurable Circuit to Compensate for a Low Noise Amplification Input Matching Variation and a Method for Its Configuration - A method for changing an effective capacitance of an amplifier circuit having a match transistor and a coupled cascode transistor includes changing an on-state of at least one of a plurality of sub-transistors of the match transistor. The method further includes changing a transconductance of the match transistor as a function of the change of the on-state. The method further includes changing an equivalent resistance, as measured between a source and a drain of the cascode transistor, as a function of the change of the transconductance of the match transistor. | 08-20-2009 |
20100259331 | HIGH-LINEARITY LOW NOISE AMPLIFIER - Embodiments of a high-linearity low-noise amplifier (LNA) are generally described herein. Other embodiments may be described and claimed. In some embodiments, an RF input signal may be amplified with a cascode amplifier. The cascode amplifier may include integrated notch filters to attenuate undesired signals. The cascode amplifier may operate from a large power supply when blockers are present to avoid voltage swing compression at its output. The cascode amplifier may be biased and designed to operate in a class AB mode to produce linear output current to avoid current compression or excessive current expansion. | 10-14-2010 |
20140361838 | AMPLIFIER FOR TELEVISION TUNER CHIP AND METHOD THEREFOR - An amplifier includes a negative gain amplifier, a load element, and a transconductance device. The negative gain amplifier has an input and an output. The load element has a first terminal coupled to a power supply voltage terminal, and a second terminal. The transconductance device has a first current electrode coupled to the second terminal of the load element, a control electrode coupled to the output of the negative gain amplifier, and a second current electrode coupled to the input of the negative gain amplifier. | 12-11-2014 |
20160043698 | TUNABLE POWER AMPLIFIER WITH WIDE FREQUENCY RANGE - A circuit includes an amplifier configured to amplify an input signal and generate an output signal. The circuit also includes a tuning network configured to tune frequency response of the amplifier. The tuning network includes at least one tunable capacitor, where the at least one tunable capacitor includes at least one micro-electro mechanical system (MEMS) capacitor. The amplifier could include a first die, the at least one MEMS capacitor could include a second die, and the first die and the second die could be integrated in a single package. The at least one MEMS capacitor could include a MEMS superstructure disposed over a control structure, where the control structure is configured to control the MEMS superstructure and tune the capacitance of the at least one MEMS capacitor. | 02-11-2016 |
330306000 | And bandpass, broadband (e.g., wideband) or sidepass means | 23 |
20080204148 | AMPLIFIER WITH INTEGRATED FILTER - An amplifier with integrated filter (e.g., an LNA) is described. In one design, the amplifier may include a gain stage, a filter stage, and a buffer stage. The gain stage may provide signal amplification for an input signal. The filter stage may provide filtering for the input signal. The buffer stage may buffer a filtered signal from the filter stage. The amplifier may further include a second filter stage and a second buffer stage. The second filter stage may provide additional filtering for the input signal. The second buffer stage may buffer a second filtered signal from the second filter stage. All of the stages may be stacked and coupled between a supply voltage and circuit ground. The filter stage(s) may implement an elliptical lowpass filter. Each filter stage may include an inductor and a capacitor coupled in parallel and forming a resonator tank to attenuate interfering signals. | 08-28-2008 |
20080218273 | TUNABLE RF BANDPASS TRANSCONDUCTANCE AMPLIFIER - Aspects of the disclosure can provide a bandpass transconductance amplifier that can include a minuend transconductance amplifier that converts a voltage signal to a first current and a subtrahend transconductance amplifier that converts the voltage signal to a second current having substantially the same amplitude as the first current but opposite polarity in both a first and a second stopband. The second current can have a substantially smaller amplitude than the first current in a passband. The disclosed bandpass transconductance amplifier can also include a controller that can tune the passband and the stopbands and a summing circuit that can add the first current and the second current. | 09-11-2008 |
20090021309 | Fully Integrated Ultra Wideband Transmitter Circuits and Systems - Disclosed is a novel design of a fully integrated UWB transmitter. The transmitter includes a pulse generator, a pulse modulator, and an ultra-wideband drive amplifier. A new low voltage low power pulse generator circuit is disclosed which can be fully integrated in CMOS or BiCMOS process. This circuit includes a squaring stage, an exponential stage, and a second-order derivative stage. Based on this, PPM, BPSK and PAM pulse modulator circuits and system are disclosed. The modulated pulse is symmetrical second-order derivative Gaussian pulses with a bandwidth up to 5 GHz and having sufficient swing for UWB applications. An ultra-wideband driver amplifier is proposed to amplify the modulator output and drive the antenna. For the driver amplifier, common source resistor and inductor shunt feedback with current reuse technique is employed to achieve the ultra-wideband bandwidth, high gain, and providing matching for the antenna simultaneously. | 01-22-2009 |
20090039965 | LOW-LOSS ELECTRICAL COMPONENT WITH AN AMPLIFIER - An electrical component includes an amplifier that includes an output stage, and a power-supply path for powering the output stage. The power supply path includes a line that includes conductor track sections in parallel. The electrical component also includes a carrier substrate containing the amplifier and the line with the conductor tracks. | 02-12-2009 |
20090108944 | LOW-NOISE AMPLIFIER CIRCUIT INCLUDING BAND-STOP FILTER - A low-noise amplifier circuit includes a MOS transistor in a common gate amplifier configuration. A single-ended input is at a source of the MOS transistor. A resonant cavity filter circuit is coupled to a gate of the MOS transistor. | 04-30-2009 |
20090115532 | IMAGE SIGNAL AMPLIFYING CIRCUIT AND AMPLIFYING SEMICONDUCTOR INTEGRATED CIRCUIT - An image signal amplifying circuit comprises: an amplifier circuit for amplifying an image signal; an output capacitor and a resistance, both being serially connected between an output node of the amplifier circuit and an output terminal; and a second-order high pass filter having a value of Q larger than one, the second-order high pass filter being provided at a preceding stage of the amplifier circuit, wherein distortion to correct a sag arising in a high pass filter on an output side, the high pass filter including the output capacitor and the resistance, is caused in the input image signal by a characteristic of the second-order high pass filter. | 05-07-2009 |
20090146741 | High-frequency amplifier, high-frequency module, and mobile wireless apparatus using the same - A high-frequency amplifier with high linearity is provided that is easy to integrate and is resistant to variations in transistor characteristics due to process variation. The high-frequency amplifier includes a bias circuit to bias an amplifying element that amplifies high frequencies. The bias circuit has a feedback circuit including a feedback loop in which a circuit with low pass characteristics and having a capacitor one end of which is grounded is inserted. A stable bias voltage is thus provided, which makes it possible to improve the linearity of the high-frequency amplifier. | 06-11-2009 |
20100060362 | CASCODE CIRCUIT - A cascode circuit for a high-gain or high-output millimeter-wave device that operates with stability. The cascode circuit including two cascode-connected transistors includes: a first high electron mobility transistor (HEMT) including a source that is grounded; a second HEMT including a source connected to a drain of the first HEMT; a reflection gain restricting resistance connected to the gate of the second HEMT, for restricting reflection gain; and an open stub connected to a side of the reflection gain restricting resistance which is opposite the side connected to the second HEMT, for short-circuiting high-frequency signals at a predetermined frequency and nearby frequencies. | 03-11-2010 |
20100060363 | WIDEBAND LOW-NOISE AMPLIFIER - A wideband low-noise amplifier includes a source-degenerated common-source amplifier, a common-gate amplifier, and a matching frequency band determiner. The source-degenerated common-source amplifier is configured to amplify an input signal to output a first signal that is opposite in phase to the input signal. The common-gate amplifier is connected in parallel to the source-degenerated common-source amplifier to amplify the input signal to output a second signal that has the same phase as the input signal. The matching frequency band determiner is configured to isolate an input terminal of the source-degenerated common-source amplifier and an input terminal of the common-gate amplifier and determine a matching frequency band. | 03-11-2010 |
20100073092 | METHOD AND APPARATUS FOR TREATING A RECEIVED SIGNAL TO PRESENT A RESULTING SIGNALWITH IMPROVED SIGNAL ACCURACY - A signal treating apparatus for presenting an output signal representing an input signal over a signal range includes: (a) an input section receiving the input signal and presenting a first filtered signal limited to a first bandwidth at a first circuit locus; the input section presenting a second filtered signal limited to a second bandwidth at a second circuit locus; (b) an amplifying unit receiving the first filtered signal and presenting an increased gain signal at an amplifier output locus; (c) a detector coupled with the amplifier output locus and presenting third bandwidth-limited signal limited to a third bandwidth less than the first bandwidth at a third circuit locus; and (d) a combining section coupled with the second and third circuit loci and presenting a resulting signal related with the second filtered signal and the third filtered signal; said resultant signal being said output signal. | 03-25-2010 |
20100079211 | MATCHING CIRCUIT, AND RADIO-FREQUENCY POWER AMPLIFIER AND MOBILE PHONE INCLUDING THE SAME - Provided is a matching circuit, radio-frequency power amplifier, and mobile phone whereby the second harmonic can be suppressed and the loss of fundamental due to the self resonant frequency of components can be reduced. The output matching circuit includes: a transmission line through which a radio-frequency signal is transmitted; and resonators each of which includes a capacitor. The resonators respectively have (i) first terminals connected to substantially a same connecting point on the transmission line and (ii) second terminals that are grounded. | 04-01-2010 |
20100194480 | AMPLIFYING DEVICE - The present invention concerns an amplifying device arranged to receive an input signal having a certain duty cycle. The amplifying device comprise a first switching unit having an input terminal adapted to receive a first half of the input signal, and an output terminal adapted to be connected to a first signal output where a first half of an output signal is provided. The amplifying device comprise a second switching unit having an input terminal adapted to receive a second half of the input signal and an output terminal adapted to be connected to a second signal output where a second half of the output signal is provided. Also, the first switching unit and the second switching units are adapted to receive an input signal, wherein the first half of said input signal has the same duty cycle as the second half of the input signal but shifted in phase. The present invention also concerns a wireless transceiver and a radio transmission device. | 08-05-2010 |
20110148529 | RADIO FREQUENCY AMPLIFIER WITH EFFECTIVE DECOUPLING - A variety of circuits, methods and devices are implemented for radiofrequency amplifiers. According to one such implementation, a radiofrequency amplifier circuit is implemented in a SMD package. The circuit amplifies a radiofrequency signal having a base-band portion and a plurality of carrier signals frequency-spaced larger than the base-band bandwidth. The circuit includes a radiofrequency transistor connected to a circuit output having a parasitic output capacitance. The source-drain terminal is electrically connected to the circuit output. An internal shunt inductor provides compensation for the parasitic output capacitance. A high-density capacitor is connected between the internal shunt inductor and a circuit ground. The high-density capacitor has a terminal with a surface area can be at least ten times that of a corresponding planar surface. | 06-23-2011 |
20110204982 | POWER AMPLIFIER AND BRIDGE CIRCUIT IN POWER AMPLIFIER - A power amplifier and a bridge circuit in a power amplifier, thereinto, the power amplifier includes a comparator, a bridge circuit and a low-pass filter. The comparator is adapted to receive a first analog signal, compare the first analog signal with a reference signal and output a square wave signal. The bridge circuit is adapted to amplify the square wave signal and output the amplified square wave signal. The low-pass filter is adapted to convert the amplified square wave signal into a second analog signal. The bridge circuit includes a first MEMS switch and a second MEMS switch. The first MEMS switch and the second MEMS switch turn on alternately when the polarity of the square wave changes, and output a first voltage signal or a second voltage signal respectively. The amplified square wave signal includes the first voltage signal and the second voltage signal output alternately. The present disclosure substitutes the MOS transistors in prior art with surface MEMS switches, so the power consumption, the size of devices and the manufacture costs all can be reduced. | 08-25-2011 |
20130307629 | POWER AMPLIFICATION CIRCUIT - A power amplification circuit amplifies and then outputs transmission signals of a first frequency and a second frequency, which are different from each other. When the transmission signal of the first frequency is input, a first switch is turned ON, a first LC parallel resonant circuit enters a resonant state and the transmission signal is transmitted using a line containing a first capacitor as a main line. When the transmission signal of the second frequency is input, a second switch is turned ON, a second LC parallel resonant circuit enters a resonant state and the transmission signal is transmitted using a line containing a second capacitor as a main line. Therefore, a transmission signal does not pass through, using as a main line, a line into which a switch has been incorporated. | 11-21-2013 |
20140062604 | System and Method for a Power Amplifier - In accordance with an embodiment, a system includes a first amplifier and a first bandpass filter having an input coupled in series with an output of the first amplifier, and an output configured to be coupled to a load. The bandpass filter has a lower input impedance at an in-band center frequency than at out-of-band frequencies, and the first amplifier is configured to receive a pulse width modulated waveform filtered according to a first transfer function that attenuates sidebands of the pulse width modulated waveform. | 03-06-2014 |
20140097906 | Single Stage Buffer With Filter - A single-stage buffer apparatus includes a first transistor, a second transistor, and a high pass filter network. The first transistor is configured to receive an input signal from a microphone. The second transistor is configured to operate as a cascode transistor. The high pass filter network is coupled to the first transistor and the second transistor. The second transistor electrically decouples the first transistor from an output of the single-stage buffer apparatus. A gate terminal of the second transistor is driven by the high-pass filter network, and the high-pass filter network is driven by the first transistor. | 04-10-2014 |
20140167864 | TUNABLE WIDE BAND DRIVER AMPLIFIER - A tunable wide band driver amplifier is disclosed. In an exemplary embodiment, an apparatus includes a first band selection circuit selectively connected between an output terminal of an amplifier and a circuit ground. The first band selection circuit configured to adjust an amplification band from a first frequency band to a second frequency band. The apparatus also includes a first harmonic reduction circuit selectively connected between the first band selection circuit and the circuit ground and configured to reduce 2 | 06-19-2014 |
20140184341 | INTEGRATION OF SIGNAL SAMPLING WITHIN TRANSISTOR AMPLIFIER STAGE - Embodiments of the invention are generally directed to integration of signal sampling within a transistor amplifier stage. An embodiment of an apparatus includes a amplifier stage including a transistor to receive a source signal and produce an output signal, wherein the transistor includes multiple fingers for at least a first electrode of the transistor. The amplifier stage uses connections to some of the fingers of the first electrode for production of the output signal, and uses one or more other fingers for the first electrode of the transistor for a separate function from the production of the output signal. | 07-03-2014 |
20140253249 | CIRCUIT FOR PROVIDING A FLAT GAIN RESPONSE OVER A SELECTED FREQUENCY RANGE AND METHOD OF USE - An integrated circuit is disclosed. The integrated circuit includes an amplifier and a capacitor array coupled to the amplifier. The capacitor array is configured to be coupled in parallel to an inductor that is external to the integrated circuit, and the capacitor array and the external inductor comprise a tank circuit. The integrated circuit includes a resistor array coupled in parallel with the capacitor array. The resistor array is utilized to provide an overall frequency response of the capacitor array and resistor array that is opposite of a frequency response of the external inductor over a predetermined frequency range. | 09-11-2014 |
20140340159 | Circuit Layout and Method for Frequency-Dependent Matching of a High-Frequency Amplifier Stage - A circuit for frequency-dependent matching of a high-frequency amplifier stage includes high-frequency stage with an output to a total high-frequency path that divides a total frequency band into a plurality of partial frequency paths for respectively preset partial frequency bands. The outputs of the plurality of partial frequency paths are reunited again into the total high-frequency path, following the processing of the partial frequency bands of these partial frequency paths. The partial frequency paths include a matching network surrounded by a first and second pass filter. At least one partial frequency path is switchable, when a control signal is supplied thereto. | 11-20-2014 |
20140361839 | NONLINEAR CAPACITANCE LINEARIZATION - An apparatus, which includes a first electronic device, a first nonlinear capacitance compensation circuit, and a capacitance compensation control circuit, is disclosed. The first electronic device has a first nonlinear capacitance and is coupled to the first nonlinear capacitance compensation circuit, which has a first compensation capacitance and receives a first compensation control signal. The capacitance compensation control circuit adjusts the first compensation capacitance using the first compensation control signal to at least partially linearize the first nonlinear capacitance. | 12-11-2014 |
20150123736 | WIDEBAND DRIVER AMPLIFIER - A wideband driver amplifier with embedded passive filtering and gain peaking is described. The wideband driver amplifier comprises a voltage to current circuit, a passive band-selection filter, and a current to voltage circuit. The driver amplifier features an Embedded CLC-Ladder band-selection filter and thereby immune to process variations. | 05-07-2015 |