| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 455318000 | With specified local oscillator structure or coupling | 28 |
| 20080242253 | Frequency converter and radio receiver using the same - According to an embodiment of the invention, there is provided a frequency converter including: an input circuit converting a voltage signal to a current signal; a load circuit supplying a constant current to an input circuit; a first switch circuit configured to output a current signal from the first output terminal in accordance with a switching made in accordance with a first oscillation signal; a second switch circuit configured to output the current signal from the second output terminal in accordance with a switching made in accordance with a second oscillation signal being 180 degrees out of phase with the first oscillation signal; a control circuit generating a control current based on a predetermined reference voltage and an average voltage of the voltages at the first and second output terminals and adding the control current to the current signal of the input circuit. | 10-02-2008 |
| 20090104886 | SIGNAL PROCESSING DEVICE, CONTROL METHOD OF SIGNAL PROCESSING DEVICE, DIGITAL BROADCAST RECEIVING DEVICE, AND CONTROL METHOD OF DIGITAL BROADCAST RECEIVING DEVICE - A signal processing device includes: a first converting unit for frequency-converting the input signal into a signal in a first frequency band; a filter for cutting off the frequency component outside a predetermined pass band; a second converting unit for frequency-converting the signal from the first frequency band to a second frequency band; third converting unit for converting the signal in the second frequency band into a signal in a third frequency band coinciding with the pass band; an oscillating unit for oscillating a signal used for frequency conversion of the third converting unit; and a detecting unit for detecting a frequency error between oscillation frequency of the signal oscillated by the oscillating unit and frequency of a signal used for frequency conversion from the second frequency band to the third frequency band coinciding with the pass band, and outputting an error signal indicating the frequency error. | 04-23-2009 |
| 20090170465 | Electronic Mixer - The present invention discloses a mixer comprising with an input stage ( | 07-02-2009 |
| 20090280767 | TIME-MULTIPLEXED COMMON MODE FEEDBACK FOR PASSIVE QUADRATURE RF MIXERS - A passive, differential RF mixer reduces second order intermodulation interference while maintaining I/Q isolation via common mode feedback wherein the I and Q error signals in the feedback path are time multiplexing using a four-phase LO signal. An RF signal is received at a differential input having a center tap. The RF signal is mixed with an in-phase differential signal of the four-phase local oscillator signal in a differential mixer (I mixer). The RF signal is also mixed with a quadrature-phase differential signal Q components of the four-phase local oscillator signal in a differential mixer (Q mixer). The common mode levels of the I and Q differential mixer outputs are compared to a reference DC voltage to generate I and Q error signals. The I and Q error signals are time-multiplexed, and fed back to the RF input center tap. | 11-12-2009 |
| 20090286500 | SPECTRALLY CONSTRAINED LOCAL OSCILLATOR SWITCHING - A method and frequency converter for a radio rapid frequency signal scanning and including a local oscillator signal synthesis source ( | 11-19-2009 |
| 20100015940 | RADIO RECEIVER - In a radio receiver, the receive signal is conditioned in parallel in at least two paths, in one path a first mixing oscillator signal lying above a channel center by an absolute value, and in a second path a second mixing oscillator signal lying below the channel center by an absolute value, and furthermore, special components are able to be filtered out using filters, and subsequently the signals are conditioned and/or combined in a suitable manner. | 01-21-2010 |
| 20100041360 | Evolved EDGE Receiver - The wireless receiver of the present invention accommodates dual-carrier Evolved EDGE without significantly impacting existing receiver architectures. The inventive receiver comprises a shared local oscillator and two image-rejecting downconverters. The local oscillator generates a local oscillator frequency between two carrier frequencies of adjacent radio channels. The receiver receives a signal in each of the adjacent radio channels. In a dual-carrier mode, a first image-rejecting downconverter uses the local oscillator frequency to downconvert a first signal received in the first radio channel while rejecting a second signal received in the second radio channel. A second image-rejecting downconverter uses the local oscillator frequency to downconvert the second signal while rejecting the first signal. In a diversity mode, the first and second image-rejecting downconverters use the local oscillator frequency to downconvert the signal received in one of the radio channels while rejecting the signal received in the other radio channel. | 02-18-2010 |
| 20100087159 | MIXER WITH LOCAL OSCILLATOR FEED-FORWARD AND METHOD OF MIXING SIGNALS WITH LOCAL OSCILLATOR FEED-FORWARD - A feed-forward device is provided for a mixer including a diplexer having a radio frequency port, an intermediate frequency port, and a common port; and a mixing circuit receiving an in-phase local oscillator signal and an out-of-phase local oscillator signal and having an output coupled to the common port of the diplexer. The feed-forward device includes: a first signal sampler having an input adapted to sample the in-phase local oscillator signal and to output a sampled in-phase local oscillator signal; a second signal sampler having an input adapted to sample the out-of-phase local oscillator signal and to output a sampled out-of-phase local oscillator signal; and an arrangement for coupling the sampled in-phase local oscillator signal and the sampled out-of-phase local oscillator signal to the common port of the diplexer. | 04-08-2010 |
| 20100285769 | Radio Device Having Dynamic Intermediate Frequency Scaling - Methods and apparatuses are provided for dynamic frequency scaling of an intermediate frequency (IF) signal within a radio device. | 11-11-2010 |
| 20110009083 | SYNTHESIZER AND RECEPTION DEVICE - A synthesizer includes a synthesizer unit for generating a local oscillation signal based on a reference oscillation signal output from a reference oscillation unit including a MEMS resonator, a frequency fluctuation detector for detecting a frequency fluctuation of the MEMS resonator, and a frequency adjuster for adjusting a frequency of the local oscillation signal based on the frequency fluctuation detected by the frequency fluctuation detector. This synthesizer can output a signal with a stable frequency, even when an MEMS resonator demonstrating a large fluctuation in an oscillation frequency to temperatures is used. | 01-13-2011 |
| 20110028115 | Receiver apparatus having filters implemented using frequency translation techniques - A method and apparatus is disclosed to effectively frequency translate a filter characterized as a low quality factor (Q) filter corresponding to a baseband frequency of approximately zero Hertz or to an intermediate frequency (IF) to a filter characterized as a high Q filter at frequencies greater than the baseband frequency or the IF. A downconversion mixer is used to frequency translate a communication signal to the baseband frequency or the IF using a first local oscillator signal to provide a downconverted communication signal. A filter characterized as the low Q filter corresponding to the baseband frequency or the IF filters the downconverted communication signal to provide a filtered communication signal. An upconversion mixer is used to frequency translate a communication signal using a second local oscillator signal, the second local oscillator signal being substantially similar in frequency of the first local oscillator signal. The frequency translation by the upconversion mixer, in effect, translates the filter characterization from the low Q filter to the high Q filter at frequencies greater than the baseband frequency or the IF. | 02-03-2011 |
| 20110059715 | Apparatus and Method for Down-Converting Electromagnetic Signals by Controlled Charging and Discharging of a Capacitor - Methods, systems, and apparatuses for down-converting and up-converting an electromagnetic signal. In embodiments, the invention operates by receiving an electromagnetic signal and recursively operating on approximate half cycles of a carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to forme a down-converted signal. In embodiments, up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency. When the invention is being used in the frequency modulation or phase modulation implementations, the oscillating signal is modulated by an information signal before it causes the switch to gate a bias signal. The output of the switch is filtered, and the desired harmonic is output. | 03-10-2011 |
| 20110076979 | SHIELDED DIFFERENTIAL INDUCTOR - A shielded differential inductor forms a high quality factor (high-Q) inductor that is configured to attenuate frequency spurs and/or noise from magnetic coupling generated by electrical structures on or off of a substrate as well as interference received by other components from magnetic coupling generated by the inductor. The shielded differential inductor includes a differential inductor and a shield that substantially isolates the electrical field between the inductor and the substrate to reduce substrate current loss. The shield includes sets of finger structures that extend beyond the width of the inductor and a hub and spoke configuration of ground conductors that connect the sets of finger structures to ground. | 03-31-2011 |
| 20110275341 | IP2 CALIBRATION MEASUREMENT AND SIGNAL GENERATION - A radio frequency receiver on an integrated circuit (RFIC) includes an oscillator circuit, which generates a radio frequency (RF) oscillatory signal having a predetermined frequency that is outside of an intermediate frequency passband of the RFIC. An amplitude modulator modulates the RF oscillatory signal to produce an amplitude modulated signal which is applied to a mixer that downconverts the amplitude modulated signal. A calibration circuit receives the downconverted signal, including second order modulation (IM2) products, and, responsive to the IM2 products, generates a bias signal that is applied to the mixer to reduce the IM2 products. | 11-10-2011 |
| 20120164966 | RECEIVER FOR FSK RADIO FREQUENCY SIGNALS WITH HIGH SENSITIVITY DEMODULATOR AND METHOD FOR ACTIVATING THE SAME - The high sensitivity FSK radiofrequency signal receiver includes an antenna for receiving FSK radiofrequency signals, a LNA amplifier receiving signals picked up by the antenna, a local oscillator for supplying oscillating signals, a mixer for mixing the incoming signals with the oscillating signals to produce intermediate signals. The receiver includes a broadband or poly-phase filter for filtering the intermediate signals, and a sampler for supplying sampled intermediate signals to a high sensitivity demodulation stage, which supplies data signals. The receiver includes a processing circuit for performing a discrete Fourier transform of sampled intermediate signals. The selector at the processing circuit output determines the difference between the signal amplitude peak frequency above a determined threshold and the expected frequency of the intermediate signals. The frequency difference enables for correcting the oscillating signals frequency, to enable the demodulation stage to demodulate the data in the sampled intermediate signals and supply data signals. | 06-28-2012 |
| 20130237170 | ARBITRARY MULTIBAND OVERLAY MIXER APPARATUS AND METHOD FOR BANDWIDTH MULTIPLICATION - An apparatus and method for splitting a wide band input signal and overlaying multiple frequency bands on each path associated with one or more digitizers. All frequencies from the split signal on each path can be fed to a mixer. The local oscillator of each mixer receives a sum of signals, which can each be set to any arbitrary frequency, as long as an associated matrix determinant of coefficients is non-zero. Each oscillator signal is multiplied by a coefficient, which can represent phase and magnitude, prior to summing the oscillator signals together. Each mixer mixes a combined signal with the input, thereby generating a set of multiple overlaid frequency bands. The digitized signals are processed to substantially reconstruct the original input signal. Thus, the wide band input signal is digitized using multiple individual digitizers. In particular, a system can support two wide band signals using four digitizers of narrower bandwidth. | 09-12-2013 |
| 20140155014 | RECEIVER IIP2 ANALOG CALIBRATION - Techniques for performing analog calibration of a receiver to optimize a second-order input intercept point (IIP2). In an aspect, a signal generator modeling an interferer is coupled to an adjustable input of a receiver, e.g., a gate bias voltage of a mixer. For example, the signal generator output may be a single-tone on-off keying (OOK) modulated signal. The mixer mixes the signal down to baseband, wherein an analog correlator correlates the down-converted signal with the known sequence of bits used to perform the OOK modulation. The analog correlation output is then provided to drive the bias voltage in the mixer, e.g., one or more gate voltages of transistors in the differential mixer, to optimize the overall receiver IIP2. Further aspects of the disclosure provide for calibrating receivers having multiple LNA's, and also dual or diversity receivers having multiple receive paths. | 06-05-2014 |
| 455319000 | With particular coupling | 11 |
| 20080242254 | RX DUAL-BAND MIXER - A dual-band input transceiver block is formed to operably receive one of a 2.4 GHz radio frequency signal or a 5.0 GHz radio frequency transceiver signal in a manner that minimizes duplication of circuitry and creates a combined circuit path for RF front end input stages for much of the input stage. More specifically, the embodiments of the present invention include separate amplification and mixing stages whose outputs are combined by a stabilized load with circuitry for removing a common mode feedback signal. As such, downstream components, such as amplifiers, filters, analog-to-digital converters, and other input path circuit elements, are not duplicated and may be used regardless of whether the dual-band transceiver is operating in a first or second frequency band. Operation is, in the described embodiment, only one frequency input at a time though the invention is not limited to such operation. More specifically, a first input section is operably coupled to receive a first local oscillation input and a first frequency band signal input. A second input section is coupled to receive a second local oscillation input and a second frequency band signal input. Outputs of the first and second input sections are produced to a stabilized load with a common mode feedback block for removing a common mode feedback signal. As such, an output signal is produced having a regulated DC level and having any common mode feedback signal eliminated there from. | 10-02-2008 |
| 20080287087 | Merged high pass filtering and down-converting mixer circuit - According to one exemplary embodiment, a mixer circuit comprises first and second switching branches driven by a local oscillator and an input radio frequency (RF) signal. The mixer circuit further comprises at least one capacitor coupled between the first and second switching branches for high-pass filtering of a down-converted output signal of the mixer circuit. In one embodiment, each switching branch comprises a respective mixer transistor, for example, a field effect transistor (FET). In one embodiment, the mixer circuit includes an inductor to reduce or eliminate the effects of parasitic capacitors at a resonance frequency selected to approximately match a desired RF signal frequency. In one embodiment, an inductor at resonance with parasitic capacitors produces a band pass filter for an input RF signal. | 11-20-2008 |
| 20080299935 | IC with saw-less RF front-end - An IC includes an RF front end, a down conversion module, an up conversion module, and a local oscillation generating module. The RF front end includes a receive section, a transmit section, and an interference reduction module. The receive section receives an inbound RF signal within a receive frequency band and the transmit section transmits an outbound RF signal within a transmit frequency band. The interference reduction module is coupled to at least one of the receive section and the transmit section and facilitates at least one of: attenuating energy of the outbound RF signal within the receive frequency band based on a transmit local oscillation or a receive local oscillation; and attenuating energy of the inbound RF signal within the transmit frequency band based on the transmit local oscillation or the receive local oscillation. | 12-04-2008 |
| 20090023413 | Cross Coupled High Frequency Buffer - A local oscillator (LO) buffer circuit comprises first and second LO buffers arranged in a cross coupled configuration. The first LO buffer generates in-phase output signals in response to in-phase input signals, and quadrature output signals from the second LO buffer. The second LO buffer generates the quadrature output signals in response to quadrature input signals and the in-phase output signals. The LO buffers may include inductive loads. The LO buffers may include MOS transistors or bipolar junction transistors. | 01-22-2009 |
| 20090088121 | High Linearity and Low Noise Mixer - Circuits and methods for a mixer circuit involve having a first transistor with first and second terminals, where the first terminal is configured to handle an input RF signal. The mixer has a second transistor including a first terminal coupled to the second terminal of the first transistor, a second terminal configured to handle an input oscillator signal, and a third terminal configured to output an intermediate frequency (IF) signal. The IF signal includes a mixed product of the input RF signal and the input oscillator signal. A gate oxide thickness of the first transistor is less than a gate oxide thickness of the second transistor to provide enhanced linearity and a low noise figure. One or more of the mixers can be implemented in a receiver design. | 04-02-2009 |
| 20110081880 | WIDEBAND RECEIVER FOR WIRELESS COMMUNICATION SYSTEM AND METHOD FOR CONTROLLING THE SAME - A wideband receiver for a wireless communication system and a method for controlling the same are provided. In the wideband receiver for a wireless communication system, a receive path includes a mixer for receiving a Radio Frequency (RF) signal having a frequency f | 04-07-2011 |
| 20120220254 | METHODS AND SYSTEMS FOR DOWN-CONVERTING A SIGNAL USING A COMPLEMENTARY TRANSISTOR STRUCTURE - Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a emodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal. | 08-30-2012 |
| 20120252395 | RECEIVER CAPABLE OF CONCURRENTLY COLLECTING DUAL BAND SIGNALS, AND METHOD THEREOF - A receiver of a GNSS system is provided. The receiver comprises two mixers and a processing circuit. The first mixer down-converts an input radio-frequency signal comprising a first GNSS signal and a second GNSS signal into a first low-frequency signal. The second mixer down-converts the input radio-frequency signal into a second low-frequency signal. The processing circuit generates at least one phase-shifted low-frequency signal according to at least the first low-frequency signal, extract signal components of the first GNSS signal by rejecting signal components of the second GNSS signal according to the second low-frequency signal and the at least one phase-shifted low-frequency signal, and extract signal components of the second GNSS signal by rejecting signal components of the first GNSS signal according to the second low-frequency signal and the at least one phase-shifted low-frequency signal. The first and second GNSS signals are situated in different frequency ranges. | 10-04-2012 |
| 20140349600 | SUBHARMONIC MIXER - A sub-harmonic mixer comprising a mixer circuit with input ports for RF and LO signals, and an output port for the product of the signals at the input ports, and an LO switching stage with input ports for an LO signal and the LO signal phase shifted 180 degrees. The LO switching stage comprises a third input port to which the output port of the mixer circuit is connected and a first output port for the product of the signal at its third and first input ports, and a second output port for the product of the signal at the third and second input ports with the same amplitude as the first output signal 180 degrees phase shifted. In the sub-harmonic mixer the mixer circuit comprises a transconductance mixer. | 11-27-2014 |
| 455320000 | Lumped impedance | 2 |
| 20090131007 | High Dynamic Range Time-Varying Integrated Receiver for Elimination of Off-Chip Filters - A receiver circuit comprising a quadrature passive mixer having an input and an output, and an input impedance of the quadrature passive mixer provides a band-pass response. One or more output impedances coupled to the output of the quadrature passive mixer. A low noise amplifier (LNA) having an input and an output coupled to the quadrature passive mixer, the LNA configured to provide substantially linear transconductance over a predetermined input range. | 05-21-2009 |
| 20110092176 | High Dynamic Range Time-Varying Integrated Receiver for Elimination of Off-Chip Filters - A receiver circuit includes an amplifier, an output impedance, and a mixer. The amplifier is arranged to generate an amplifier output. The mixer has an input and an output respectively coupled to the amplifier and the output impedance. The output impedance sets frequency selectivity provided at the input of the mixer, and the mixer is arranged to down-convert a signal derived from the amplifier output and accordingly generate a down-converted signal at the output of the mixer for further signal processing. | 04-21-2011 |
