Class / Patent application number | Description | Number of patent applications / Date published |
455325000 | Including distributed electrical parameter structure | 62 |
20090068975 | QUADRATURE-INPUT, QUADRATURE-OUTPUT, DIVIDER AND PHASE LOCKED LOOP, FREQUENCY SYNTHESISER OR SINGLE SIDE BAND MIXER - The present invention relates to a quadrature divider which may be used in a phase locked loop or frequency synthesiser or with a single side band mixer. According to a preferred embodiment the divider takes a quadrature input and has a quadrature output. The divider has four analog mixers | 03-12-2009 |
20090075619 | MIXER CIRCUIT AND RADIO COMMUNICATION DEVICE USING THE SAME - A mixer circuit includes a voltage-to-current converter which converts a positive phase input voltage signal and a reversed phase input voltage signal input to a first input terminal and a second input terminal into a positive phase current signal and a reversed phase current signal, a switching circuit switches over the positive phase current signal and the reversed phase current signal according to a positive phase local signal and a reversed phase local signal, and generates a positive phase output current signal and a reversed phase output current signal, and an impedance element connected between the first common terminal and the second common terminal, having a relatively high impedance to a differential-mode signal between the positive phase current signal and the reversed phase current signal, and having a relatively low impedance to a common-mode signal between the positive phase current signal and the reversed phase current signal. | 03-19-2009 |
20090170466 | CIRCUIT WITH PROGRAMMABLE SIGNAL BANDWIDTH AND METHOD THEREOF - A circuit with programmable signal bandwidth is provided. The circuit includes a first charge and discharge device, a first reset device, and a first variable capacitor device. The first reset device is coupled to the first charge and discharge device, and the first variable capacitor device is coupled to the first charge and discharge device. The first reset device is controlled by a discharge enable signal and used to provide a first discharge path. When the discharge enable signal turns off the first reset device, the first variable capacitor device generates a first total equivalent capacitor to the first charge and discharge device according to n reference signals, and n is an integer greater than 0. | 07-02-2009 |
20100093302 | Discrete Time Direct Sampling Circuit and Receiver - Provided are a direct sampling circuit and a receiver using a discrete time analog process and having a filter effect of a steep attenuation characteristic in a narrow-pass band without lowering a sampling rate. In a discrete time direct sampling circuit ( | 04-15-2010 |
20100203860 | Passive Mixer Mismatch Tuning Using Self-Tests to Suppress IM2 - The second-order inter-modulation distortion, originating in a differential passive mixer core from imbalance between devices, is reduced by compensating for the mismatch or load, by means of tuning the differential output impedance at the mixer core, or the input impedance of a filter coupled to the output of the passive mixer. Compensating for the imbalance allows greater suppression of even-order harmonics in the differential structure, which reduces second-order intermodulation at the output of the mixers. The compensation is achieved by tunable resistive elements that are calibrated by a built-in self-test architecture. The calibration circuit is deactivated during receiver operation. | 08-12-2010 |
20100323655 | COMMON-GATE COMMON-SOURCE TRANSCONDUCTANCE STAGE FOR RF DOWNCONVERSION MIXER - In an embodiment, a method and apparatus for downconverting a received RF signal in a wireless device where differential signals from an off-chip matching network may be input to a CGCS input stage of a mixer, which downconverts the signals to baseband or some intermediate frequency. The input stage includes a pair of NMOS transistors in a common-gate configuration and a pair of PMOS transistors in a common-source configuration. A potential advantage of the CGCS input stage over the existing CGO transconductance stage configuration is that by adding a common-source stage through the PMOS differential-pair, the transconductance gain is decoupled from the high Q matching network. | 12-23-2010 |
455326000 | With balanced mixer | 55 |
20080248775 | DYNAMIC CURRENT STEERING MIXER - A dynamic current steering mixer. The dynamic current steering mixer comprises a Gilbert cell mixer core, a pair of load devices, a dynamic current steering cell, and a transconductor cell. The Gilbert cell mixer core has first and second nodes, receives a first differential input signal, and provides a differential output signal at the first nodes thereof. The load devices are respectively coupled between the first nodes of the Gilbert cell mixer core and a first fixed voltage. The dynamic current steering cell has third nodes coupled to the second nodes and fourth nodes. The transconductor cell is coupled between the fourth nodes and a second fixed voltage and receives a second differential input signal. The dynamic current steering cell alternately steers current of the transconductor cell to or away from the Gilbert cell mixer core. | 10-09-2008 |
20080254759 | High linearity frequency conversion system and method - A frequency converter ( | 10-16-2008 |
20080305759 | Mixer Circuit - The invention relates to a mixer circuit | 12-11-2008 |
20090061812 | Multipulse/Multitone Mixing Receiver - An apparatus adapted for measuring the properties of periodic signals and a method for making such measurements is disclosed. The apparatus includes a LO signal generator, a mixer, a low pass filter and an output device. The LO signal generator generates an LO signal comprising a fundamental frequency ω | 03-05-2009 |
20090075620 | LOCAL OSCILLATOR BUFFER AND MIXER HAVING ADJUSTABLE SIZE - Selectable sizes for a local oscillator (LO) buffer and mixer are disclosed. In an exemplary embodiment, LO buffer and/or mixer size may be increased when a receiver or transmitter operates in a high gain mode, while LO buffer and/or mixer size may be decreased when the receiver or transmitter operates in a low gain mode. In an exemplary embodiment, LO buffer and mixer sizes are increased and decreased in lock step. Circuit topologies and control schemes for specific exemplary embodiments of LO buffers and mixers having adjustable size are disclosed. | 03-19-2009 |
20090081985 | METHOD AND SYSTEM FOR A DISTRIBUTED TRANSCEIVER WITH DDFS CHANNEL SELECTION - Aspects of a method and system for a distributed transceiver with DDFS channel selection may include frequency-translating a first signal to generate one or more second signals utilizing a distributed mixer and an in-phase and quadrature mixing stage. The first signal may be an input signal to the distributed mixer, which may comprise a plurality of frequency conversion stages. The input signal to the distributed mixer may be an input signal to at least one of the plurality of frequency conversion stages and an output signal of the distributed mixer may be generated from one or more output signals or the plurality of conversion stages. The output signal from the distributed mixer may be an input signal to the in-phase and quadrature mixing stage and the one or more second signals may be generated from one or more output signals of the in-phase and quadrature mixing stage. | 03-26-2009 |
20090149150 | SYSTEMS, DEVICES, AND METHODS FOR SUPPRESSING FREQUENCY SPURS IN MIXERS - Systems, devices and methods are disclosed for suppressing the 2LO frequency spur, output from a mixer. In various exemplary embodiments, a DC bias circuit is electrically connected to provide DC bias to one or more non-linear elements of the mixer. The biasing voltage is used to cause the current-voltage characteristics and/or junction capacitances between non-linear elements to be more symmetric and/or to suppress 2LO leakage currents that form 2LO frequency spurs at the output of the mixer. The non-linear elements may comprise one of: BJT's, diodes, and FET's. The mixer may be one of: a subharmonic mixer; a fundamental resistive mixer; a fundamental subharmonic transconductance mixer; and a fundamental transconductance mixer comprising an anti-parallel diode pair. The system may further be configured to automatically determine an appropriate DC bias voltage level that will improve one of the LO-IF isolation and the LO-RF isolation. | 06-11-2009 |
20090203347 | MIXER CIRCUITS FOR SECOND ORDER INTERCEPT POINT CALIBRATION - A balanced mixer circuit ( | 08-13-2009 |
20090221258 | Balanced Series Mixer for High-Frequency Signals - A balanced series mixer including a balun transformer ( | 09-03-2009 |
20090291662 | BALANCED MIXER WITH CALIBRATION OF LOAD IMPEDANCES - A calibration device is coupled to a balanced circuit device including first and second outputs provided with first and second load impedances. The calibration device includes an adjusting circuit to adjust the first and second load impedances into a load imbalance for linearization. A coupling circuit is inserted between the adjusting circuit and the first and second outputs to selectively couple the adjusting circuit to one of the first and second outputs, so that the adjusting circuit is coupled in parallel either to the first load impedance or to the second load impedance. | 11-26-2009 |
20100081408 | Re-Configurable Passive Mixer for Wireless Receivers - A configurable passive mixer is described herein. According to one exemplary embodiment, the passive mixer comprises a clock generator, a controller, and a plurality of passive mixer cores connected in parallel. The clock generator comprises a local oscillator drive unit for each passive mixer core. The controller varies an effective transistor size of the passive mixer by separately configuring each of the passive mixer cores to enable/disable each passive mixer core. For example, the controller may selectively enable one or more of the passive mixer cores to vary the effective transistor width of the passive mixer. As the performance requirements and/or the operating communication standard change, the controller may re-configure each passive mixer core. | 04-01-2010 |
20100081409 | MINIATURIZED DUAL-BALANCED MIXER CIRCUIT BASED ON A MULTILAYER DOUBLE SPIRAL LAYOUT ARCHITECTURE - A miniaturized dual-balanced mixer circuit based on a multilayer double spiral layout architecture is proposed, which is designed for use to provide a frequency mixing function for millimeter wave (MMW) signals, and which features a downsized circuit layout architecture that allows IC implementation to be more miniaturized than the conventional star-type dual-balanced mixer (DBM). The proposed miniaturized dual-balanced mixer circuit is distinguished from the conventional star-type DBM particularly in the use of a 3-dimensional double-spiral circuit layout architecture for the layout of two balun circuit units. This feature allows the required layout area to be only about 15% of that of the conventional star-type DBM. | 04-01-2010 |
20100105350 | LOW-NOISE MIXER - The system and method of the present invention provide a single mixer ( | 04-29-2010 |
20100112973 | GENERATION OF A COMPOSITE MITIGATION SIGNALWITH A DESIRED SPECTRAL ENERGY DISTRUBUTION | 05-06-2010 |
20100151811 | Direct Conversion Pre-ADC Frequency Mixer - A system for single path processing identical, substantially identical, close or interfering frequencies with a single analog-to-digital converter. The system receives a plurality of input signals at various frequencies and front end circuits filter out first and second frequencies. A mixer and a front end oscillator are in communication with one of the front end circuits for mixing a front end frequency with one of the first and second frequencies prior to the analog-to-digital converter. A summer combines the output of the mixer with the output of one of the front end circuits. An analog-to-digital converter is connected to the summer for converting the analog input signal to a digital output signal. The first and second frequencies may be separately processed after they have been combined, even if they were identical frequencies. | 06-17-2010 |
20100167683 | Apparatus and Method for Local Oscillator Calibration in Mixer Circuits - An apparatus and method for local oscillator calibration compensates for filter passband variation in a mixer circuit, such as a receiver circuit. The receiver includes at least a mixer circuit and a filter coupled to the output of the mixer. During operation, the mixer mixes an RF input signal with a first local oscillator (LO) signal to frequency translate a selected channel in the RF input signal into the passband of the filter. During a calibration mode, the RF input signal is disabled, and the first LO signal is injected into the filter input by leaking the first LO signal through the mixer circuit. The frequency of the LO signal is then swept over a frequency bandwidth that is sufficiently wide so that the actual passband is detected by measuring the signal amplitude at the output of the bandpass filter, thereby determining any variation in the passband of the filter from the expected passband. Once the actual passband is determined, then the frequency of the first local oscillator signal is adjusted or tuned to compensate for any frequency shift of the actual passband compared to the expected passband. Therefore, the selected channel is up-converted into the center of the actual passband of the bandpass filter and will not fall outside the passband. This enables the passband of the bandpass filter to be narrowed, as compared with conventional receivers that do not utilize this calibration procedure. For example, the bandpass filter can be narrowed to one or two channels wide. | 07-01-2010 |
20100173601 | VERY LOW INTERMEDIATE FREQUENCY (VLIF) RECEIVER - A very low intermediate frequency (VLIF) receiver comprising a first and second mixer circuits, characterised in that receiver comprises a means of estimating the energy in a desired signal band; a means of estimating the energy in a band of frequencies comprising the desired signal band; and a means of altering a VLIF of the receiver according to the ratio of the energy in a desired signal band and the energy in the band of frequencies comprising the desired signal band. | 07-08-2010 |
20100233988 | RECEIVING APPARATUS - A receiving apparatus includes an analog demodulation unit, a digital demodulation/decoding unit, a delay unit, a reception state detecting unit, first/second processing units, and a mixing processing unit. The analog demodulation unit demodulates a first audio signal. The digital demodulation/decoding unit demodulates and decodes a second audio signal. The delay unit delays at least one of the first and second audio signals, to be outputted as third and fourth audio signals. The reception state detecting unit outputs an analog reception state signal. The first/second audio processing units control at least one of volume and quality of the third/fourth audio signals, to be outputted as fifth and sixth audio signals. The mixing processing unit mixes the fifth and sixth audio signal at a predetermined ratio, outputted according to a reception state of at least one of a broadcast wave of analog broadcasting and the broadcast wave of digital broadcasting. | 09-16-2010 |
20110009084 | PASSIVE HIGH FREQUENCY IMAGE REJECT MIXER - The apparatus is a complete passive implementation of an image reject mixer (IRM) that is capable of operating at very high frequency. Using a hybrid as part of the IRM circuit enables operation at very high frequencies that also employs a high intermediate frequency (IF). All the components of the design are passive and implementable in MOS technologies providing significant cost and implementation advantages. Furthermore, the apparatus is operative at frequencies that are higher than several tens of GHz. | 01-13-2011 |
20110039511 | RECEIVER FRONT END - A low-power receiver front-end includes a transconductance amplifier that produces a single-ended current signal in response to a single-ended voltage signal. An output of the transconductance amplifier is provided to an LC tuned circuit. At resonance, the LC tuned circuit generates a differential current signal in response to the single-ended current signal. Single-ended current signals corresponding to the resonant frequency of the LC tuned circuit are converted into differential signals. Further, the LC tuned circuit amplifies the differential current signals by an associated quality factor. Further, a mixer is coupled to an output of the LC tuned circuit. The mixer generates IF signals in response to the differential current signals. | 02-17-2011 |
20110065412 | MIXER CIRCUIT, INTEGRATED CIRCUIT DEVICE AND RADIO FREQUENCY COMMUNICATION UNIT - A mixer circuit comprises an input stage arranged to convert an input voltage signal received at an input of the mixer circuit into at least one current signal, and a frequency conversion stage comprising at least one switching element arranged to convert a signal component of the at least one current signal from an input frequency to a output frequency. The input stage comprises at least one resistance connected between the input of the mixer circuit and the at least one switching element. The at least one switching element and the at least one resistance are arranged such that the at least one switching element comprises a ‘turn-on’ resistance that exhibits a resistivity that is a factor less than the at least one resistance connected thereto. | 03-17-2011 |
20110092178 | DOUBLED BALANCED MIXER WITH IMPROVED COMPONENT MATCHING - An improved passive double balanced mixer with reduced capacitor voltage mismatch is described. A passive double balanced mixer includes two sets of mixer circuits, each comprised of switches. Each switch is separately divided into a first portion and a second portion of unequal number of fingers. A first and second LO AC coupling capacitors associated with a given switch are coupled at one end to an LO signal. The outputs of the first LO AC coupling capacitors are coupled to the first portion of the first switch and the second portion of the second switch, respectively, while the outputs of the second LO AC coupling capacitors are coupled to the second portion of the first switch and the first portion of the second switch, respectively. In one embodiment, the unequal number of fingers is defined by an n−1 and an n+1 number of fingers, respectively. In an alternate embodiment, the mixer is an ADB mixer with a transconductance amplifier and two sets of mixer circuits as above. | 04-21-2011 |
20110124309 | HETERODYNE RECEIVER - A down-conversion module for a heterodyne receiver comprises a first mixer circuit, a second mixer circuit and an interconnection. The first mixer circuit includes first and second differential control terminals and is arranged to produce a first down-converted differential voltage signal at a first down-converted frequency as a function of a first RF differential input signal applied to the first differential control terminals and of a first RF differential reference frequency signal applied to the second differential control terminals. The second mixer circuit includes two differential pairs of second amplifier elements and the second amplifier elements comprise second differential control terminals and cross-connected pairs of second amplifier output paths for producing a second down-converted differential voltage signal at a second down-converted frequency as a function of the first down-converted differential voltage signal and of a second RF differential reference frequency signal applied to the second differential control terminals. The interconnection includes transmission line elements and is arranged to apply a differential current signal which is a function of the first down-converted differential voltage signal to differential input terminals of the second mixer circuit common to respective pairs of the second amplifier elements. | 05-26-2011 |
20110201296 | MIXER CIRCUITS FOR SECOND ORDER INTERCEPT POINT CALIBRATION - A balanced mixer circuit ( | 08-18-2011 |
20110230157 | EQUIVALENT RADIO FREQUENCY NOTCH FILTER, RADIO FREQUENCY CHIP, AND RECEIVER - An equivalent radio frequency (RF) notch filter, an RF chip, and a receiver are provided. The equivalent RF notch filter includes: a local oscillation (LO) circuit, configured to provide a LO frequency signal; configured to be connected in parallel with the main chain, and down-convert signals of the main chain; and a frequency selective circuit realized by impedance difference, configured to provide different impedances for down-converted signals with different frequencies from the mixing circuit, so as to absorb the signals that need to be suppressed. | 09-22-2011 |
20110250861 | HIGHLY INTEGRATED, HIGH FREQUENCY, HIGH POWER OPERATION MMIC - A system and method for high frequency, high power operation communication systems is provided. More particularly, a system and method for a single system-on-chip system monolithic microwave integrated circuit that provides both high-frequency performance at a low cost is provided. | 10-13-2011 |
20110312295 | Double balanced mixer - An improved double balanced mixer is provided which in one embodiment includes a first balun for receiving a first single input and providing a first balanced output having two ports, a second balun for receiving a second single input and providing a second balanced output having two ports, and a balanced mixer core responsive to the first and second balanced outputs to provide a mixed signal from the first and second single inputs. The first balun includes an RC network coupled between at least one of the ports of the first balanced output and one of ground and a common mode node of the first balun to improve the linearity of the double balanced mixer. | 12-22-2011 |
20120196554 | High Dynamic Range Time-Varying Integrated Receiver for Elimination of Off-Chip Filters - A receiver circuit includes a quadrature passive mixer, a first charge load, and a second charge load. The quadrature passive mixer has a differential input for receiving a differential input signal, and arranged for mixing the differential input signal with a quadrature local oscillator (LO) signal. The quadrature passive mixer has an in-phase mixer with a differential in-phase output, and a quadrature-phase mixer with a differential quadrature-phase output. The first and second charge loads are coupled to differential in-phase output and differential quadrature-phase output, respectively. In every quarter cycle of the quadrature LO signal, the differential in-phase output and the differential quadrature-phase output are arranged to be not shorted so as to avoid charging sharing between the first charge load and the second charge load, or are arranged to be shorted to cause charging sharing between the first charge load and the second charge load that generates a leakage path. | 08-02-2012 |
20120238232 | METHOD AND SYSTEM FOR LOW-NOISE, HIGHLY-LINEAR RECEIVER FRONT-END - Aspects of a method and system for a low-noise, highly-linear receiver front-end are provided. In this regard, a received signal may be processed via one or more transconductances, one or more transimpedance amplifiers (TIAs), and one or more mixers to generate a first baseband signal corresponding to a voltage at a node of the receiver, and a second baseband signal corresponding to a current at the node of the receiver. The first signal and the second signal may be processed to recover information from the received signal. The first signal may be generated via a first one or more signal paths of the receiver and the second signal may be generated via a second one or more signal paths of the receiver. | 09-20-2012 |
20130084822 | APPARATUS GENERATING SUBCARRIER FOR TRANSMISSION BETWEEN ULTRA-HIGH FREQUENCY CHANNELS AND METHOD GENERATING OF THE SAME - Apparatus for generating a plurality of radio-frequency RF subcarrier signals for transmission between two adjacent ultra-high frequency UHF broadcast channels comprises a signal generator for generating a plurality of local oscillator LO signals, and a plurality of mixers each arranged to mix one of the LO signals with one of a plurality of input signals to generate one of the RF subcarrier signals, said input signal including information to be transmitted by said RF subcarrier signal. Variable gain amplifiers can be provided to independently amplify the RF subcarrier signals before they are combined. The LO signals can have the same frequency and the input signals can have different frequencies, or the LO signals can have different frequencies and the input signals can have the same frequency. A second LO signal with a different frequency to a first LO signal can be obtained by dividing a reference frequency by a predetermined value and mixing with the first LO signal. Methods of generating a plurality of RF subcarrier signals are also disclosed. | 04-04-2013 |
20130115907 | VARIABLE DUTY-CYCLE MULTI-STANDARD MIXER - An adjustable mixer is disclosed that is capable of operating in different modes in order to satisfy the mixing requirement of multiple radio access technologies (RATs). The adjustable mixer includes a LO signal generating portion and a mixing portion. Depending on the mixing requirements of the RAT, the adjustable mixer can operate in any one of multiple modes, each mode having a specific configuration for the LO signal generating portion and the mixing portion. The LO signal generating portion generates a LO signal having a particular duty cycle, depending on the selected mode, for use by the mixing portion. The mixing portion has an adjustable circuit configuration that can be dynamically reconfigured based on the selected mode, and which allows the mixing portion to successfully mix received signals using the corresponding LO signals generated by the LO signal generating portion. | 05-09-2013 |
20130149983 | ACCURATE RADIO FREQUENCY FILTERING USING ACTIVE INTERMEDIATE FREQUENCY FEEDBACK - A receiver, such as a television tuner, includes a radio frequency (RF) filter circuit. The RF filter circuit includes a filter, a first node, and a second node coupled to the filter, and a conversion signal path having an input coupled to the first node and an output coupled to the second node, the conversion signal path having an active mixer coupled between the first node and the second node. The active mixer can include, for example, a first transconductor and a first mixer coupled in series between the first node and the second node. The RF filter circuit further includes a feedback signal path having an input coupled to the second node and an output coupled to the first node, the feedback signal path including a second transconductor and a second mixer coupled in series between the second node and the first node. | 06-13-2013 |
20130178183 | Implementing A Passive Rotating Harmonic Rejection Mixer (RHRM) For A TV Tuner In An Integrated Circuit - In one embodiment, a passive rotating harmonic rejection mixer (RHRM) is provided that can directly couple to an antenna to receive an incoming radio frequency (RF) signal. This RHRM can have a master RF device to receive the signal and provide first and second RF currents, a master LO device coupled to an output of the master RF device to receive the RF currents and mix them with a master clock signal of multiple polarities to obtain a mixed signal pair. The RHRM may further include a rotating switch coupled to the master LO device to cyclically switch the mixed signal pair to one of multiple virtual ground nodes at an output of the rotating switch, and operational amplifiers each having a first input terminal coupled to one of the virtual ground nodes and having a feedback filter coupled thereto. | 07-11-2013 |
20130183921 | Complex Intermediate Frequency Mixer Stage and Calibration Thereof - The invention relates to a complex intermediate frequency (CIF) mixer stage, methods of operation thereof, and methods of calibration thereof. The CIF mixer stage comprises numerous individual mixers driven by IF clock signals to down-convert received IF signals into a set of signals at baseband frequency which are further combined to form a lower side band signal and an upper side band signal. The IF clock signals used have a predefined phase relationship among them, which involves tunable phase skews. By calibration of the conversion gains and the phases of the IF clock signals the gain and phase imbalance introduced in a preceding radio frequency mixer stage and/or the CIF mixer stage can be cancelled. Further, in-channel IQ leakage control can be applied to the lower side band signal and/or the upper side band signal. The CIF mixer stage can thus effectively suppress image interference and IQ leakage. | 07-18-2013 |
20130196611 | FREQUENCY CONVERSION DEVICE FOR WIRELESS SYSTEMS - A frequency conversion device for transforming a frequency of an input signal, the device comprising: a signal generator for providing a plurality N of first signals at a first frequency, where N≧1, from an input signal having an in-phase component I and a quadrature signal component Q; an oscillator for generating N parallel oscillation signals, wherein the N oscillation signals are stepped in phase with respect to one another; a mixer comprising N mixing components, each mixing component being coupled to receive a respective one of the plurality of first signals and coupled to receive a respective oscillation signal for mixing the respective first signal with the corresponding oscillation signal to provide an output signal; and a common amplifier for receiving the N output signals from the N mixing components in N sequential phases for transmission. | 08-01-2013 |
20130267188 | DISCRETE TIME POLYPHASE MIXER - Embodiments of a radio frequency (RF) circuit provide translational filtering in accordance with an input impedance response that is an impedance image of a reactive circuit impedance response from a poly phase reactive circuit. The RF circuit may include a first mixer circuit that provides a first frequency offset for the impedance image and a second mixer circuit that provides an additional frequency offset. Accordingly, the second mixer circuit may allow for adjustments to a total frequency offset of the impedance image. The second mixer circuit may also be configured so that the impedance image rejects a negative frequency impedance response of the reactive circuit impedance response. | 10-10-2013 |
20130295870 | SINGLE-ENDED RECEIVER WITH A MULTI-PORT TRANSFORMER AND SHARED MIXER - A single-ended receiver is described. The single-ended receiver includes a multi-port transformer that outputs a differential signal. The multi-port transformer includes a first primary coil that is coupled to an output of a first low noise amplifier. The multi-port transformer also includes a second primary coil that is coupled to an output of a second low noise amplifier. The multi-port transformer further includes a first secondary coil. The single-ended receiver also includes a shared mixer that receives the differential signal from the multi-port transformer. | 11-07-2013 |
20140030996 | LINEARITY IN PASSIVE MIXER CIRCUITS - A circuit used in a mixer configured to receive a signal made up of a relatively small modulation signal and a relatively large carrier signal is described. The mixer includes multiple switches. A balancing circuit configured to receive a supply voltage and a clocking signal is provided, and the balancing circuit provides a control signal to a switch in the mixer. The balancing circuit includes a capacitor configured to receive and selectively dissipate charge as a gate voltage along a gate path. The control signal causes switching of the switch in the mixer at times in accordance with the clocking signal according to a voltage difference value between a source voltage and the gate voltage, wherein the voltage difference value between the source voltage and the gate voltage is approximately a predetermined voltage value greater than a turn on voltage level of the switch. | 01-30-2014 |
20140030997 | Frequency Translation Filter Apparatus and Method - A frequency translation filter | 01-30-2014 |
20140030998 | SYSTEMS AND METHODS FOR COMBINING SIGNALS FROM MULTIPLE ACTIVE WIRELESS RECEIVERS - Systems and methods for combining signals from multiple active wireless receivers are discussed herein. An exemplary system comprises a first downconverter, a phase comparator, a phase adjuster, and a second downconverter. The first downconverter may be configured to downconvert a received signal from a first antenna to an intermediate frequency to create an intermediate frequency signal. The phase comparator may be configured to mix the received signal and a downconverted signal to create a mixed signal, compare a phase of the mixed signal to a predetermined phase, and generate a phase control signal based on the comparison, the downconverted signal being associated with the received signal from the first antenna. The phase adjuster may be configured to alter the phase of the intermediate frequency signal based on the phase control signal. The second downconverter may be configured to downconvert the phase-shifted intermediate frequency signal to create an output signal. | 01-30-2014 |
20140038542 | Rotating Harmonic Rejection Mixer - In one embodiment, the present invention includes a mixer circuit to receive and generate a mixed signal from a radio frequency (RF) signal and a master clock signal, a switch stage coupled to an output of the mixer circuit to rotatingly switch the mixed signal to multiple gain stages coupled to the switch stage, and a combiner to combine an output of the gain stages. | 02-06-2014 |
20140057586 | Systems and methods for improving the time alignment of non-overlapping waveforms - Systems and methods for improving the timing alignment of non-overlapping waveforms are provided. In this regard, a representative system, among others, includes a waveform synthesizer that generates a plurality of input waveforms and inverters having inputs and outputs, wherein the inverters receive the input waveforms at the inputs of the inverters and invert the input waveforms, producing a plurality of inverted waveforms at the outputs of the inverters. The system also includes NOR gates having inputs and outputs, wherein the NOR gates receive the plurality of inverted waveforms at the inputs of the NOR gates and pass through one of the inverted waveforms at the outputs of the NOR gates. | 02-27-2014 |
20140080437 | RECEIVER CIRCUIT AND ASSOCIATED METHOD - A receiver circuit, e.g., a low-IF receiver, including two mixing paths. The two mixing paths scale an input signal respectively by two mixing gains and shift phase of the input signal respectively by two mixing phase offsets to provide two mixed signals. The two mixing gains and the two mixing phase offsets are arranged to produce an amplitude adjustment between amplitudes of the two mixed signals and a phase difference of 90 degrees plus a phase adjustment between phases of the two mixed signals. With the amplitude adjustment and/or the phase adjustment properly tuned to nonzero value(s) in association with band-pass response of the receiver circuit, image rejection can be achieved and optimized. Associated method is also disclosed. | 03-20-2014 |
20140171009 | Radio Frequency Receiver - A radio frequency receiver for receiving an analog radio frequency signal, the radio frequency receiver comprising a sampling mixer being configured to sample the analog radio frequency signal using a predetermined sampling rate (f | 06-19-2014 |
20140179253 | DIVERSITY RECEIVER WITH SHARED LOCAL OSCILLATOR SIGNAL IN DIVERSITY MODE - A multi-mode receiver is disclosed that is reconfigurable to share a local oscillator signal in diversity mode to save power consumption. In an exemplary embodiment, an apparatus includes a primary receiver having a primary mixer configured to down-convert a primary signal and a secondary mixer configured to down-convert a secondary signal in carrier aggregation mode. The apparatus also includes a supplemental mixer that uses a shared primary local oscillator (LO) signal generated by a shared primary frequency synthesizer in diversity mode to reduce power consumption. The apparatus further includes a controller configured to disable the secondary mixer and to enable the supplemental mixer to down-convert the secondary signal when operating in the diversity mode. | 06-26-2014 |
20140179254 | CARRIER FREQUENCY OFFSET COMPENSATION APPARATUS AND ASSOCIATED METHOD - A carrier frequency offset compensation method for a communication system is provided. The method includes: mixing, filtering and interpolating an input signal according to a mixing parameter, a first filtering parameter and a first interpolation parameter, respectively, to generate a processed result; calculating a carrier frequency offset estimation value of the input signal according to the processed result; adjusting the mixing parameter according to the carrier frequency offset estimation value; and mixing, filtering and interpolating the input signal according to the adjusted mixing parameter, a second filtering parameter and a second interpolation parameter, respectively. The first interpolation parameter is associated with a cut-off frequency corresponding to the first filtering parameter. | 06-26-2014 |
20140242937 | INSTRUMENT LO USED AS ALIGNMENT SIGNAL SOURCE - A system can include an input signal source, a local oscillator (LO), and an intermediate frequency (IF) receiver to receive an input signal from the input signal source and an LO signal from the LO. The IF receiver can include a switch to switch between the first and second inputs to provide an output. The IF receiver can generate a calibration signal from the LO signal. | 08-28-2014 |
20140370832 | Efficient Dual Channel Conversion In A Multi-Band Radio Receiver - In an embodiment, an apparatus includes a first signal path to receive and process a radio frequency (RF) signal of a first band and which has a first programmable digitizer to convert the RF signal of the first band into a digitized signal without downconversion. In addition, the apparatus further includes a second signal path to receive and process an RF signal of a second band, where at least portions of one or more of the paths may be shared during operation in the different bands. | 12-18-2014 |
20140370833 | DOWN-CONVERSION CIRCUIT WITH INTERFERENCE DETECTION - A down-conversion circuit for a receiver circuit is disclosed. It comprises a first mixer arranged to down-convert an RF signal with a first LO signal (LO | 12-18-2014 |
20150133070 | WIRELESS SIGNAL RECEIVING DEVICE AND METHOD - The present invention discloses a wireless signal receiving device and method capable of receiving three or more signals of different central frequencies. An embodiment of said device comprises: a receiving circuit operable to generate a reception signal according to a wireless signal including a first, second, and third wireless signals of different central frequencies; a mixer operable to generate a mixing signal by processing the reception signal according to an oscillation clock in which the mixing signal includes a first, second and third intermediate-frequency (IF) signals and the central frequency of the third IF signal is higher than the other two; and a digital signal generating circuit operable to generate a first, second and third digital signals by processing the first, second and third IF signals according to a sampling frequency in which the sampling frequency is lower than two times the maximum frequency of the third IF signal. | 05-14-2015 |
20150318824 | Variable Duty-Cycle Multi-Standard Mixer - An adjustable mixer is disclosed that is capable of operating in different modes in order to satisfy the mixing requirement of multiple radio access technologies (RATs). The adjustable mixer includes a LO signal generating portion and a mixing portion. Depending on the mixing requirements of the RAT, the adjustable mixer can operate in any one of multiple modes, each mode having a specific configuration for the LO signal generating portion and the mixing portion. The LO signal generating portion generates a LO signal having a particular duty cycle, depending on the selected mode, for use by the mixing portion. The mixing portion has an adjustable circuit configuration that can be dynamically reconfigured based on the selected mode, and which allows the mixing portion to successfully mix received signals using the corresponding LO signals generated by the LO signal generating portion. | 11-05-2015 |
20160049913 | RESISTOR NETWORK AND MIXER CIRCUITS WITH PROGRAMMABLE GAIN - A resistor network comprises one or more switched resistor branches. Each switched resistor branch comprises a first resistor connected in series with a first switch, wherein a first terminal of the first resistor is connected to the input terminal of the resistor network, a second terminal of the first resistor is connected to a first terminal of the first switch forming a middle node, and a second terminal of the first switch is connected to the output terminal of the resistor network. Each switched resistor branch further comprises a second resistor connected in series with a second switch, wherein the series connected second resistor and second switch is connected between the middle node and a third terminal of the one or more switched resistor branches. The resistor network further comprises a third resistor connected between the input and output terminals of the resistor network. | 02-18-2016 |
20160126894 | PHASE SHIFTING MIXER - Performing quadrature combining and adjusting including: a plurality of mixing circuits configured to generate a plurality of frequency converted signals; at least one mixing circuit of the plurality of mixing circuits is configured with a plurality of paths, each path representing one linearity mode; and a plurality of combining circuits configured to combine the plurality of frequency converted signals to generate a differential baseband output signal. | 05-05-2016 |
455327000 | Stripline | 2 |
20080248776 | High-frequency circuit - A mixer circuit receives a local signal and an input signal so as to output a high-frequency signal generated based on the received signals. An output buffer receives the high-frequency signal. A band-pass filter having predetermined characteristics is formed by using the parameters of passive elements included in an output equivalent circuit as viewed from an output terminal of the mixer circuit and the parameters of passive elements included in an input equivalent circuit as viewed from an input terminal of the output buffer circuit. | 10-09-2008 |
20080280583 | Submillimeter wave heterodyne receiver - In an embodiment, a submillimeter wave heterodyne receiver includes a finline ortho-mode transducer comprising thin tapered metallic fins deposited on a thin dielectric substrate to separate a vertically polarized electromagnetic mode from a horizontally polarized electromagnetic mode. Other embodiments are described and claimed. | 11-13-2008 |
455330000 | With nonlinear impedance (e.g., diode) | 1 |
20110059716 | UPCONVERTER - A hybrid upconverter has a low noise amplifier and a two port parametric amplifier. The parametric amplifier has a first port to receive an input signal to be amplified and upconverted and a second port to receive a local oscillator signal and to output the amplified, upconverted signal at upper and lower sideband frequencies. The parametric amplifier further has an antenna coupled to the second port to receive the local oscillator signal and transmit the amplified, upconverted signal at upper and lower sideband frequencies. The low noise amplifier drives the first port of the parametric amplifier. The two port parametric amplifier has a pair of varactor diodes connected between the first port and the second port. The diodes are connected in parallel from the first port and in series from the second port. The low noise amplifier is connected directly to the pair of varactor diodes. | 03-10-2011 |