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7623839 |
Semiconductor integrated circuit
A semiconductor integrated circuit including: a mixer circuit which includes a first MOS transistor a second MOS transistor; a third MOS transistor whose drain is connected to a first potential,...
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7616938 |
Mixer offset cancellation without generating I/Q imbalance
An offset cancellation scheme in which offset cancellation current is sourced into one differential branch of a driver circuit and sinked from the opposite differential branch. The source/sink...
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7616937 |
Subharmonic mixer capable of reducing noise and enhancing gain and linearlty
A subharmonic mixer, including an amplification unit for amplifying an input signal using at least one pair of amplification devices connected in parallel and a mixing unit for mixing the amplified...
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7616045 |
Mixer with balanced local oscillator signal
A mixer includes a first field effect transistor (FET) having a gate that receives a first signal of a balanced local oscillator (LO) signal, a first source/drain coupled to a ground voltage, and a...
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7613440 |
Mixer circuit
A mixer circuit of a receiving system, requiring low noise characteristics at lower frequency, includes a bypass current source ( 41 ) which is connected in parallel with an LO transistor ( 21 )...
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7606551 |
Mixer circuit with balanced frequency mixer with varactor diodes
In a mixer circuit with a balanced frequency mixer with varactor diodes, a first input signal that exhibits a first input frequency can be fed to the frequency mixer via a first input. Furthermore,...
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7606550 |
Method and system for a dual mode receiver with low intermediate frequency (IF) and zero second IF
In RF transceivers, a method and system for a dual mode receiver with low intermediate frequency (IF) and zero second IF are provided. An RF receivers may be adapted to operate in a low IF down...
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7596362 |
DC offset calibration for a radio transceiver mixer
A mixer for a radio transceiver includes a commutating mixer switch having a first differential input port coupled to a DC offset cancellation path. The first differential input port of the mixer...
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7587224 |
Reconfigurable topology for receiver front ends
The method and apparatus of the present invention provide for a configurable radio front end topology that allows selectable operation in a single balanced mode and in a double balanced mode of...
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7587192 |
Balanced mixer with calibration of load impedances
A calibration device (CC) is coupled to a balanced circuit device (MC) comprising first and second outputs respectively provided with first (Z 1 ) and second (Z 2 ) load impedance means. This...
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7580693 |
Passive reflection mixer
In one aspect, a mixer that provides improved isolation between an input oscillator and a mixing cell. In another aspect, a mixer that includes circuitry operative to shape an input signal provided...
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7580680 |
Method of reducing imbalance in a quadrature frequency converter, method of measuring imbalance in such a converter, and apparatus for performing such method
A method is provided for reducing imbalance in a quadrature frequency converter. A test tone generator controlled by an alignment controller supplies a test signal to the input of the frequency...
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7577418 |
Sub-harmonic mixer and down converter with the same
A sub-harmonic mixer and a down converter with the sub-harmonic mixer are provided. The sub-harmonic mixer includes a differential amplifying unit, a current buffer unit, and a switching unit. The...
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7577416 |
Single balanced mixer
A single balanced mixer has a high degree of isolation between an IF signal and an RF signal and a high conversion efficiency. The single balanced mixer includes means for producing two local...
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7574190 |
Signal-processing electronics
The present invention relates to a method and an electronic circuit for processing at least two at least partially correlated output signal streams of a mixer, the mixer having at least two signal...
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7570936 |
Sub-harmonically pumped mixer
A mixing circuit is described in connection with various embodiments.
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7567789 |
Method and device for generating two signals in phase quadrature for a frequency transposition in a cellular mobile telephone
The method and device include the generation of two output signals (I RF , Q RF ) in phase quadrature, having a frequency spectrum including a dominant harmonic at a wanted frequency F C . The...
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7565128 |
High performance low noise amplifier
A signal processing circuit is proposed, which is intended to receive a pair of input signals Sp and Sn in phase opposition on two input terminals and to provide two pairs of output currents SIp...
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7558351 |
Super harmonic filter and method of filtering frequency components from a signal
A harmonic filter for filtering a plurality of frequency components from an input signal comprises a phase shifter for generating an in-phase signal and a quadrature-phase signal according to the...
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7555280 |
Apparatus for frequency direct conversion reception in mobile communication terminal and method thereof
An apparatus for frequency direct conversion reception in a mobile communication terminal and method thereof are disclosed, by which a DC offset can be removed. The present invention includes a...
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7555263 |
Adaptive radio transceiver
An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a...
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7551891 |
Method for detecting UWB pulse sequences without local pulse generation
The invention relates to a method for transmitting at least one sequence of Np pulses over Np time windows, each pulse being enclosed within a predetermined time chip Tc. The method according to...
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7522903 |
Three-phase mixer-system
Three-phase mixer-systems comprising at least three groups of mixers ( 1 - 4,5 - 8,9 - 12,30 ) for frequency translating signals are (basic idea) provided with balancing means ( 13 - 21,31 ) for...
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7509111 |
Integrated circuit having a mixer circuit
Integrated circuit including a mixer circuit, which has a first circuit section, a second circuit section, and a transformer. The first circuit section has two radiofrequency terminals. The second...
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7509110 |
High-order harmonic rejection mixer using multiple LO phases
A mixer produces an improved output signal during frequency translation of an input signal using a local oscillator (LO) signal. The mixer includes five component mixers connected in parallel. Each...
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7496343 |
Programmable mixer for reducing local oscillator feedthrough and radio applications thereof
A state of a programmable mixer is set during a calibration phase to minimize local oscillator feedthrough. During a calibration phase, inputs to the programmable mixer are set to zero, or to a...
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7493095 |
PMA RX in coarse loop for high speed sampling
A device and a method for processing high data rate serial data includes circuitry for recovering a clock based on the high data rate input data stream. A transceiver includes a coarse loop of a...
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7471134 |
Mixer with clock resynchronization and method therefor
A mixer ( 114 ) includes a phase clock generator ( 404 ), a latch ( 420 ), and a multiplier ( 118 ). The phase clock generator ( 404 ) provides a plurality of phase clock signals. The latch ( 420 )...
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7457606 |
Mixer circuit for direct conversion transceiver with improved IP2
A mixer for direct conversion transmitters and receivers using four phase-shifted local oscillation signals that are orthogonal each other to control a plurality of switches for outputting signals...
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7457605 |
Low noise image reject mixer and method therefor
A receiver ( 200 ) includes a transconductance mixer ( 310 ), a polyphase filter ( 320 ), and a transimpedance amplifier ( 330 ). The transconductance mixer ( 310 ) mixes a radio frequency (RF)...
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7449974 |
On-chip balun and transceiver using the same and method for fabricating on-chip balun
Provided are an on-chip balun, a transceiver using the on-chip balun, and a method for fabricating the on-chip balun. The on-chip balun includes: a first metal winding including a port grounded and...
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7446590 |
Low noise mixer with reduced distortion
A low noise RF mixer is described. The mixer of the present invention has excellent linearity due to reduction of second-order distortion. The mixer includes an inputting stage, a switching stage...
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7440742 |
Mixer gain calibration method and apparatus
A gain calibration circuit comprises a generator that generates a constant overdrive voltage that biases a radio frequency (RF) mixer. A reference signal generator generates a reference signal. A...
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7418250 |
Quadrature mixer circuits and mobile terminal using the same
Because there are different voltages at two current output terminals of a current divider, the voltages at the current input terminals of two current switch circuits are not affected mutually even...
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7417486 |
Voltage-current conversion circuit, amplifier, mixer circuit, and mobile appliance using the circuit
A cross-coupled low-distortion voltage-current conversion circuit has transistors T 1 to T 6 . At least one of the transistors has parallel connections of two or more transistors. By arbitrarily...
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7415257 |
Dual-band mixer and its design flow
In the dual-band mixer of this invention, a current combined load is presented and is shared by two separate working frequency bands. In the invented dual-band mixer, a switch is provided to...
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7395044 |
Signal processing apparatus and method of differential transformer
A measuring apparatus employing a differential transformer includes a high-frequency oscillator which generates a high-frequency signal having a frequency higher than the excitation frequency of...
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7392033 |
Reducing active mixer flicker noise
A mixer is disclosed that includes first and second transconductance modules that, in one embodiment, includes MOSFETs configured to receive a plurality of signals that are to be mixed and a...
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7383034 |
Frequency conversion circuit, modulation circuit, polar modulation transmitting circuit, quadrature modulation transmitting circuit, communication instrument, and frequency conversion method
A frequency conversion circuit is provided capable of suppressing noise converted from about a frequency twice as large as a local signal to a reception band frequency, which performs modulation by...
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7379727 |
RF front-end receiver
An RF front-end receiver comprises a low noise amplifier and a local oscillator driver, which are connected to respective input ports of a mixer which comprises a first and second transistor with...
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7369837 |
Frequency-mixing method and frequency-mixing device using the same
A frequency-mixing method includes a step of generating a first quadrature signal having a predetermined frequency, a second quadrature signal having a phase difference of about 180 degrees with...
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7369835 |
Image rejection mixer providing precision image rejection
An image rejection mixer includes a first mixer, a second mixer, a first output adjust circuit, and a second output adjust circuit. The first mixer is coupled to receive an input RF signal and a...
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7356317 |
Adaptive-biased mixer
A system or method for a circuit network that receives an RF signal, and where a plurality of switching transistors receive an RF signal output by the circuit network and perform mixing with a...
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7355466 |
Passive mixer with direct current bias
Mixer circuits with direct-current bias are disclosed. An example embodiment of such a mixer includes a first differential transistor pair and a second differential transistor pair. The example...
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7342432 |
Mixer circuit having improved linearity and noise figure
A mixer circuit having improved linearity and noise figure is disclosed. The mixer circuit comprises an amplification unit having an input terminal and an output terminal, the amplification unit...
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7336940 |
Frequency conversion techniques using antiphase mixing
A frequency upconverter using mixers operating on one or more signals and inverted versions thereof and a subtractor, such as a balun, for subtractively combining the mixer outputs to produce an...
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7324796 |
Low temperature co-fired ceramic sub-harmonic mixer
A sub harmonic mixer has improved electrical performance in a small package size. The mixer has a low temperature co-fired ceramic substrate. Coupled lines are located within the substrate and...
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7324791 |
Low-noise differential bias circuit and differential signal processing apparatus
A low-noise differential bias circuit is provided which obtains excellent noise characteristics while ensuring excellent distortion characteristics. A collector of a transistor Q 11 is connected...
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7308244 |
Low voltage mixer
A mixer comprising a pair of low frequency mixer inputs, a pair of high frequency mixer inputs, a pair of mixer outputs, four switching units, each switching unit comprising a low frequency...
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7305217 |
Low cost planar double balanced mixer
A double balanced mixer includes a local oscillator balun, a radio frequency balun and four diodes. The local oscillator balun has a transmission line, a half wavelength transmission line and a...
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