Class / Patent application number | Description | Number of patent applications / Date published |
330293000 | Having negative feedback | 25 |
20080252379 | High slew rate amplifier, analog-to digital converter using same, CMOS imager using the analog-to-digital converter and related methods - An amplifier, which may be used in a pipelined analog-to-digital converter, includes a first amplifier stage driving a second amplifier stage. At least one compensation capacitor is coupled to provide negative feedback through the capacitor from the second amplifier stage to the first amplifier stage. The slew rate of the amplifier is enhanced by substantially reducing the negative feedback coupled through the capacitor during a period following the transition of a signal applied to an input terminal of the amplifier. If the first stage of the amplifier has complementary signal nodes, the negative feedback coupled through the capacitor may be reduced, for example, by closing a switch coupled between first and second complementary nodes of the first amplifier stage. | 10-16-2008 |
20090115528 | Low Cost High Performance Power Amplifier Utilizing Two-Stage-Included Local Negative Feedback with Feedback-Shifting Technology - The present invention provides a cost-effective and power-effective solution to a high performance amplifier design over conventional Class A and Class B/AB amplifiers. Without increasing cost or losing simplification of conventional Class B/AB amplifier configuration, two kinds of unique local feedback loops, which cover the second and third stages and further offer a feedback shifting feature over frequency range, are disclosed to replace the traditional Miller compensation capacitor to suppress dominant distortion, which is usually generated by the two last stages while maintaining stability of the amplifier, through high frequency end. Since the present invention provides key elements of a three-stage amplifier that enable performance improvement in a wide range of circuit design, the present invention has significant commercial values in amplifier circuit industries including audio power amplifiers, IC (integrated circuit) operational amplifiers, ADC (Analog-to-Digital Conversion) and DAC (Digital-to-Analog Conversion) buffers, etc. | 05-07-2009 |
20090184769 | NEGATIVE-FEEDBACK TYPE ULTRA-WIDEBAND SIGNAL AMPLIFICATION CIRCUIT - A negative-feedback type ultra-wideband signal amplification circuit is proposed, which is designed for integration to an ultra-wideband (UWB) signal processing circuit system for providing a low-noise amplification function to UWB signals. The proposed circuit architecture is characterized by the provision of a dual-step filter circuit on the input side, the provision of a resistive-type feedback circuit in the transistor-based amplification circuitry, and the provision of a common-source transistor-based amplification circuit on the output side. These features allow the proposed signal amplification circuit to have flat power gain, lower power consumption, low noise figure, and higher operational stability. | 07-23-2009 |
20100001801 | INTERMODULATION SIGNAL GENERATOR OF POWER AMPLIFIER AND PRE-DISTORTION LINEARIZER HAVING THE SAME - Provided are an intermodulation signal generator of a power amplifier and a pre-distortion linearizer having the same. The intermodulation signal generator of the power amplifier includes: a circulator for outputting a radio-frequency (RF) input signal input via a first port to a second port and outputting an intermodulation signal input via the second port to a third port; a directional coupler for shifting phases of the input signals input via the second port of the circulator to divide or couple the phase-shifted signals; first and second Schottky diodes, disposed symmetrically, for receiving the signals divided by the directional coupler to generate intermodulation signal components; first and second phase adjusters, disposed symmetrically, for controlling phases of the intermodulation signal components gene rated by the first and second Schottky diodes by means of first and second bias voltages; and first and second scalers, disposed symmetrically, for controlling magnitudes of the intermodulation signal components generated by the first and second Schottky diodes by means of third and fourth bias voltages. The above-described intermodulation signal generator can be applied to a power amplifier of a high-performance downscaled communication system. | 01-07-2010 |
20100066452 | WIDEBAND LOW-NOISE AMPLIFIER - A wideband low-noise amplifier of the present invention is designed such that an input terminal is connected to a base of a first transistor, one terminal of a first passive element, and one terminal of a third passive element; an emitter of the first transistor is grounded; a collector of the first transistor is connected to an output terminal, a base of a second transistor, one terminal of a capacitor, and one terminal of a second passive element; the other terminal of the first passive element is connected to the other terminal of the capacitor; an emitter of the second transistor is connected to the other terminal of the third passive element; and a power terminal is connected to a collector of the second transistor and the other terminal of the second passive element, wherein impedance of the third passive element is determined based on impedance of the first transistor whose emitter size is determined to suite desired saturation level of amplification, thus establishing input impedance matching. | 03-18-2010 |
20100097146 | Signal amplification circuit - This invention provides a low-current consumption type signal amplification circuit, which limits the output voltage to fix a lower-limit (upper-limit) saturation voltage of the amplification circuit at a predetermined lower-limit (upper-limit) limiting voltage. The signal amplification circuit comprises a negative feedback amplification circuit, a lower-limit voltage limiting circuit and an upper-limit voltage limiting circuit. The lower-limit voltage limiting circuit increases a resistance between an output terminal of the negative feedback amplification circuit and a ground terminal when the output voltage of the negative feedback amplification circuit falls below the lower-limit limiting voltage. The upper-limit voltage limiting circuit increases a resistance between the output terminal of the negative feedback amplification circuit and a high-potential side of a power supply when the output voltage of the negative feedback amplification circuit rises above the upper-limit limiting voltage. | 04-22-2010 |
20100148876 | Amplifier Arrangement and Method for Amplifying a Signal - An amplifier arrangement has an amplifier ( | 06-17-2010 |
20110080220 | TEMPERATURE COMPENSATED INTEGRATOR - A representative integrator includes an amplifier having an input and an output; a feedback loop coupled between the input and the output of the amplifier, the feedback loop comprising a compensated resistor circuit having a resistance value selected for reducing a loss factor of the integrator; and a control circuit coupled to an input of the compensated resistor circuit, the control circuit producing a control signal for controlling the compensated resistor circuit to substantially maintain the resistance value selected for reducing the loss factor of the integrator across a range of integrator temperatures. | 04-07-2011 |
20110109392 | LOW NOISE AMPLIFIER - Provided is a Low Noise Amplifier (LNA). Embodiments of the present invention provide LNAs including: a common gate amplifier circuit configure to amplify a signal of an input node to which an Alternating Current (AC) component is provided and transfer the amplified signal to an amplifier node; and a negative-feedback amplifier circuit configured to amplify a signal of the amplifier node, transfer the amplified signal to an output node, wherein the negative-feedback amplifier circuit includes a feedback capacitor and a feedback inductor connected in series between the amplifier node and the output node to form a negative feedback. the LNA of the present invention forms a negative feedback exclusive of a feedback resistance, such that a broad frequency bandwidth is obtained and noise and heat are reduced. | 05-12-2011 |
20110140785 | CMOS AMPLIFIER WITH INTEGRATED TUNABLE BAND-PASS FUNCTION - A CMOS amplifier with integrated tunable band-pass function, a tunable active resistor structure, a method of amplifying an input signal and a method of fabricating an amplifier. The tunable active resistor structure comprises two symmetrically cross-coupled transistors. | 06-16-2011 |
20110148527 | Dual-Loop Feedback Amplifying Circuit - An amplifying circuit arranged for converting an input signal into an amplified output signal comprising: an input node ( | 06-23-2011 |
20120056674 | Amplification of an Incoming Signal Received Via an Antenna - In one embodiment, a method includes receiving a radio frequency (RF) at an antenna; generating negative feedback to linearize an amplifier by resistively or transformer coupling an output signal of a transistor of the amplifier to the input of the transistor; generating a rectified voltage by rectification of the output signal of the transistor; generating a constant reference voltage; and outputting a control voltage or a control current to the transistor based on the sum of the reference voltage and a first voltage derived from the rectified voltage. The output of the control voltage or control current facilitates control of an operating point of the transistor. | 03-08-2012 |
20120056675 | Operational Amplifier For An Active Pixel Sensor - The present invention includes operational amplifier for an active pixel sensor that detects optical energy and generates an analog output that is proportional to the optical energy. The active pixel sensor operates in a number of different modes including: signal integration mode, the reset integration mode, column reset mode, and column signal readout mode. Each mode causes the operational amplifier to see a different output load. Accordingly, the operational amplifier includes a variable feedback circuit to provide compensation that provides sufficient amplifier stability for each operating mode of the active pixel sensor. For instance, the operational amplifier includes a bank of feedback capacitors, one or more of which are selected based on the operating mode to provide sufficient phase margin for stability, but also considering gain and bandwidth requirements of the operating mode. | 03-08-2012 |
20120139639 | Ground Partitioned Power Amplifier for Stable Operation - Achievement of robust stability of a power amplifier (PA) that allows the sharing of the ground between the driver stages and the output stage is shown. A controlled amount of negative feedback is used to neutralize the local positive feedback that results from the driver-to-output stage ground sharing in the signal path, for example, a radio frequency (RF) signal path. The solution keeps a strong drive and a good performance of the PA. Exemplary embodiments are shown for the PA positive feedback neutralization. A first embodiment uses a ground signal divider while another embodiment uses a ground signal divider weighting technique. | 06-07-2012 |
20120194274 | INTEGRATED CIRCUIT, WIRELESS COMMUNICATION UNIT AND METHOD FOR PROVIDING A POWER SUPPLY - An integrated circuit is described for providing a power supply to a radio frequency (RF) power amplifier (PA). The integrated circuit includes a low-frequency power supply path including a switching regulator and a high-frequency power supply path arranged to regulate an output voltage of a combined power supply at an output port of the integrated circuit for coupling to a load. The combined power supply is provided by the low-frequency power supply path and high-frequency power supply path. The high-frequency power supply path includes: an amplifier including a voltage feedback and arranged to drive a power supply signal on the high-frequency power supply path; and a capacitor operably coupled to the output of the amplifier and arranged to perform dc level shifting of the power supply signal. | 08-02-2012 |
20120218043 | Amplifier Activation - An amplifier comprises a main amplification stage and an auxiliary amplification stage. An input of the main amplification stage and an input of the auxiliary amplification stage are coupled to a common node, and an output of the main amplification stage is coupled to an output node. During activation, before power is supplied to the main amplification stage, the output node is coupled to a reference voltage (V | 08-30-2012 |
20120274404 | MIXED-SIGNAL INTEGRATOR ARCHITECTURE - A mixed signal correlator utilizes coherent detection within a capacitance measurement application. In some applications, the mixed signal correlator is used to measure capacitance of a touch screen display. An external capacitor whose capacitance is measured is kept small for improved sensitivity and can be used for a variety of applications having varied integration periods for measurement. The external capacitor is kept small and can be used for varied applications by adjusting the output voltage within a range that is less than the supply voltage, and maintaining a count of the adjustments to later reconstruct an actual output voltage for the integration period. An output is a weighted sum of an analog integrator output and a digital counter output. | 11-01-2012 |
20130271220 | SEMICONDUCTOR DEVICE - Power consumption of a signal processing circuit is reduced. Further, power consumption of a semiconductor device including the signal processing circuit is reduced. The signal processing circuit includes a reference voltage generation circuit, a voltage divider circuit, an operational amplifier, a bias circuit for supplying bias current to the operational amplifier, and first and second holding circuits. The first holding circuit is connected between the reference voltage generation circuit and the bias circuit. The second holding circuit is connected between the voltage divider circuit and a non-inverting input terminal of the operational amplifier. Reference voltage from the reference voltage generation circuit and reference voltage from the voltage divider circuit can be held in the first and second holding circuits, respectively, so that the reference voltage generation circuit can stop operating. Thus, power consumption of the reference voltage generation circuit can be reduced. | 10-17-2013 |
20130293308 | METHOD AND APPARATUS FOR POWER AMPLIFIER LINEARIZATION - In an embodiment, a circuit includes a variable group delay configured to delay a wideband input signal to obtain a delayed input signal; a wideband operational amplifier configured to determine an error signal based on a difference between the delayed input signal and a linearized power amplifier output; a feedback amplifier configured to amplify the error signal to obtain an amplified error signal; and a directional combiner configured to combine the amplified error signal with the power amplifier output to obtain the linearized power amplifier output. | 11-07-2013 |
20140111281 | LOW DISSIPATION AMPLIFIER - A low dissipation, low distortion amplifier includes a driver amplifier stage and a main output stage, with a plurality of impedance networks providing, among other things, feedback paths from outputs of the driver and main output stages to the input of the driver stage. The impedance networks also provide coupling paths from the outputs of the driver and main output stages to the load. The impedance networks can all be formed of resistors, capacitors, or network combinations thereof. An additional feedback path can be added from the load to the driver stage to flatten out the frequency response at low frequencies. The driver and main output stages may be operated in Class AB and B modes respectively, and/or in Class G or H modes. An intermediate amplifier driver stage may be added between the driver and main output stages. | 04-24-2014 |
20140197892 | ON-DIE HARMONICS FILTERING FOR RADIO FREQUENCY POWER AMPLIFIERS - A power amplifier architecture for connecting a radio frequency (RF) transceiver to an antenna. An input matching circuit is connected to its input port, and an output matching circuit is connected to its output port. An amplifier circuit includes at least one amplifier active device with a first terminal connected to the input matching segment and a second terminal connected to the output matching segment. A first harmonic feedback circuit is connected across the amplifier active device. Voltage components of emissions of one or more harmonic frequencies of a carrier fundamental frequency generated by the amplifier active device is fed back with opposite phase to the first terminal of the amplifier active device. A negative feedback is defined at a level correlated with a gain level of the amplifier active device at the harmonic frequencies of the carrier fundamental frequency. Negative feedback is minimized at the carrier fundamental frequency. | 07-17-2014 |
20140232468 | SUPPRESSION CIRCUIT FOR SUPPRESSING UNWANTED TRANSMITTER OUTPUT - Aspects of the disclosure relate to a frequency suppression circuit arrangement, which allows at least one selected frequency band to be suppressed by coupling the frequency suppression circuit between the input and output of an RF power amplifier. The frequency circuit in the embodiments of the disclosure down-converts a feedback signal derived from the amplified output signal into baseband signals. Each of the baseband signals is fed into an inverting amplifier to generate a negative baseband signal. The negative baseband signal is subsequently filtered to selectively pass the negative baseband signal. The filtered signal is subsequently up-converted into an RF signal. The up-converted RF signal is combined and provided to a coupler connected at the input of the power amplifier such that when the input signal is amplified by the RF power amplifier any signals at the selected frequency can be suppressed. | 08-21-2014 |
20140292413 | TRANSIMPEDANCE PRE-AMPLIFIER WITH IMPROVED BANDWIDTH - A transimpedance pre-amplifier (TIA) with an improved bandwidth. In the TIA, a feedback circuit is added to a regulated cascode structure to be connected in parallel, so that an input resistance value is reduced and a bandwidth is easily broadened. Alternatively, an inductor is added to the regulated cascode structure, so that an input capacitance is reduced and bandwidth is easily broadened. | 10-02-2014 |
20160065153 | INVERTER TYPE POWER AMPLIFIER - The present disclosure relates to an inverter type power amplifier. An exemplary embodiment of the present disclosure provides an inverter type power amplifier including: a first transistor including a gate to which an AC type of input signal is applied through an input port, a first terminal connected a power source voltage, and a second terminal connected to an output port; a second transistor including a gate through which the input signal is applied thereto, a first terminal connected to a ground, and a second terminal connected to the output port; a feedback resistor including a first terminal connected to the input port and a second terminal connected to the output port; and an AC blocking block including a first terminal connected to the output port and a second terminal connected to a DC output port. | 03-03-2016 |
20160380596 | Sense Amplifier - A sense amplifier measures a state of a memory cell coupled to a sense node. The sense amplifier receives a control signal to enable the sense amplifier. The sense amplifier generates a voltage based on an amplifier current that is based on a sense current flowing through the sense node. The sense amplifier generates a feedback current based on the voltage to compensate variations of the sense current. The sense amplifier receives a reference control signal to enable a reference circuit to generate a reference current. The sense amplifier provides an output based on a result of comparing the sense current with the reference current, the output representing the state of the memory cell. | 12-29-2016 |