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7605634 |
Subtractor circuit and operational amplifier
Disclosed herein is a subtractor circuit for outputting an output voltage as a difference between a first input voltage and a second input voltage. The subtractor circuit may include a first...
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7603098 |
Programmable IF frequency filter for enabling a compromise between DC offset rejection and image rejection
The invention enables a compromise between DC offset rejection and image rejection through the use of a bandpass filter having a variable center frequency.
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7602227 |
Differential amplifier circuit and mixer circuit having improved linearity
The present invention relates to a differential amplifier and a mixer for improving the linearity. The differential amplifier circuit according to this present invention, includes first and second...
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7589579 |
Mixer circuit
A sub-harmonic mixer circuit having an input stage ( 52 ) and a current modulating stage ( 64 is disclosed. The input stage ( 52 ) receives an RF input signal (RF+, RF−) at a first frequency and...
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7570936 |
Sub-harmonically pumped mixer
A mixing circuit is described in connection with various embodiments.
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7554381 |
Mixer amplifier and radiofrequency front-end circuit
The mixer amplifier includes an amplification stage having a current source circuit and a plug filter adapted to modify the current circulating in the current source circuit. The amplification...
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7521981 |
Mixer with carrier leakage calibration
A mixer circuit. The mixer circuit comprises a double-balanced mixer and a carrier-leakage calibration cell. The double-balanced mixer has first and second input pairs whereby the first input pair...
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7519130 |
Front end interface for data receiver
A data receiver is provided which includes a front end interface circuit having an alternating current (AC) transmission receiving mode and a direct current (DC) transmission receiving mode. The...
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7514981 |
Mixer circuit
A mixer in a smaller signal differential model includes a load circuit, a switch quad, and a transconductor. The switch quad further including a first current path and a second current path is...
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7482852 |
Inductor-less local oscillator buffer
An N-stage inductor-less local oscillator (LO) buffer can include N−1 non-final stages and a final stage. The final stage can includes a gain circuit, a common-mode feedback circuit connected to...
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7457346 |
Spread-spectrum signal generator
A spread-spectrum signal generator includes four differential input signal terminals, a differential output signal terminal, four interconnected mixer control subcircuits, a 4-input differential...
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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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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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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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7340233 |
Integrated circuit and methods for third sub harmonic up conversion and down conversion of signals
An integrated circuit may include a receiver and/or a transmitter that performs third order sub-harmonic conversion. The integrated circuit may include a Gilbert cell active mixer with three or...
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7321253 |
Multiplier
A conventional multiplier which uses a MOS transistor has a subject that, in order to compensate for a variation of a bias voltage or the like, it is necessary to add a complicated correcting...
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7313034 |
Low supply voltage temperature compensated reference voltage generator and method
A reference voltage generator uses a conventional forward junction voltage generating device and a conventional thermal generator to generate a thermal voltage. The forward junction voltage and the...
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7298194 |
Interpolation
A steering current generator for a phase interpolator has a multiplicity of fine phase adjustment current sources, each of which is switchable to direct its current to one or other of two summing...
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7282983 |
Secure and fast calculating unit
The calculating unit includes a dual rail input stage, a switching stage for a bit to be calculated and an output stage for an output bit, wherein the output stage provides a dual rail output. The...
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7282982 |
Mixer-system with gain-blocks and switches
Mixer-systems comprising gain-blocks ( 1 - 4 ) and switches ( 5 - 8 ) have a flexibility depending upon their configuration (insight) and are made more flexible (basic idea) by supplying data input...
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7280815 |
Process for control of standby currents in a direct conversion type of frequency transposition device, and corresponding device
A direct conversion type of frequency transposition device includes a transconductor block receiving the input signal and a current switching block connected to the output from the device. At least...
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7259630 |
Elimination of peak clipping and improved efficiency for RF power amplifiers with a predistorter
A predistorer configured for use with an RF power amplifier having an input loop configured to be coupled to the input of the RF power amplifier and peak control circuit. Such an input loop...
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7259521 |
Video driver architecture for AMOLED displays
An AMOLED display system, including an AMOLED display panel receiving a video signal, includes a video driver receiving the video signal and generating a video drive signal indicative of the video...
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7245164 |
Radio frequency doubler
When a signal of a double frequency is generated from the original signal, conventionally a 90-degree phase-shift circuit is necessary to suppress an output of a DC component and efficiently obtain...
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7233190 |
Voltage subtracting circuit carrying out voltage subtraction by converting input voltage into current, intensity detecting circuit, and semiconductor integrated circuit device using the same
A voltage subtracting circuit includes a conversion circuit, a holding circuit, and a differential voltage generator. The conversion circuit converts a first voltage input during a first period...
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7227397 |
System, method and circuits for generating a signal
The present invention relates to the field of electronics. More particularly, forms of the present invention relate to systems, methods and circuits for generating a signal. A system, method and...
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7138849 |
Phase mixer that compensates for frequency variations and PVT variations and a control method thereof
Provided is a phase mixer that compensates for frequency variations and process, voltage, and temperature (PVT) variations, and automatically controls slew rates of input signals according to...
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7129761 |
Digital delay-locked loop circuits with hierarchical delay adjustment
Fine tuned signal phase adjustments are provided by multiple cascaded phase mixers. Each phase mixer outputs a signal having a phase between the phases of its two input signals. With each...
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7116588 |
Low supply voltage temperature compensated reference voltage generator and method
A reference voltage generator uses a conventional forward junction voltage generating device and a conventional thermal generator to generate a thermal voltage. The forward junction voltage and the...
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7109773 |
Flexible blender
A blender circuit configured to receive a first signal having a first signal phase and a second signal having a second signal phase. The first and second signals have a similar frequency and the...
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7102411 |
High linearity passive mixer and associated LO buffer
An RF communications system includes a transmit node for transmitting an RF information signal and a receive node for receiving the transmitted RF information signal. The receive node includes a...
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7088168 |
Direct conversion receiver using vertical bipolar junction transistor available in deep n-well CMOS technology
This invention is about the direct conversion receiver. It is excellent the receiving sensitivity that DC off-set, matching characteristics of the relationship of I/Q circuits and noise...
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7085749 |
Pulse signal circuit, parallel processing circuit, pattern recognition system, and image input system
A synaptic connection element for connecting neuron elements inputs a plurality of pulsed signals from different neuron elements N 1 through N 4, effects a common modulation (time window...
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7085549 |
Dynamic power sharing zero intermediate frequency (ZIF) mixer and method of forming same
A zero intermediate frequency (ZIF) radio frequency (RF) digital mixer ( 200 ) includes a low noise amplifier (LNA) ( 203 ), a first RF mixer stage ( 205 ) for mixing an RF signal from the at least...
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7084693 |
Sub-harmonic mixer
A sub-harmonic mixer comprises two field effect transistors (FETs) in which the drains are coupled together. The mixer includes a signal generator for generating two local oscillator signals in...
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7084676 |
Method and apparatus for fractional RF signal synthesis
The present invention provides a method to improve the frequency resolution and phase noise of a synthesized RF signal. It also results in the superior characteristics of instantaneous frequency...
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7076231 |
Receiver apparatus controlling the power consumption according to the reception signal level
A receiver apparatus is provided with a receiver section including an amplifying stage for amplifying a high frequency signal received by an antenna, a frequency converting stage for converting a...
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7057440 |
Multiplier-divider circuit for a PFC controller
The present invention introduces an integrated analog multiplier-divider circuit. The multiplier-divider block according to the present invention is ideal for use in the power factor correction...
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7023378 |
Self-calibrating wideband phase continuous synthesizer and associated methods
The synthesizer and method provide a relatively wideband swept frequency signal and include generating a first swept frequency signal with a first generator, and successively switching between...
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6995518 |
System, apparatus, and method for driving light emitting diodes in low voltage circuits
A system, apparatus, and method for allowing LED operation in circuits operating with power supply levels that are below the forward voltage limits of the LED. A first level of a modulated voltage...
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6992519 |
Method and apparatus providing cancellation of second order intermodulation distortion and enhancement of second order intercept point (IIP2) in common source and common emitter transconductance circuits
A transconductor circuit includes a first input device M 1 and a second input device M 2 each having a control terminal coupled to a radio frequency input signal, and a bias setting device M B ...
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6989705 |
High linearity passive mixer and associated LO buffer
An RF communications system includes a transmit node for transmitting an RF information signal and a receive node for receiving the transmitted RF information signal. The receive node includes a...
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6982578 |
Digital delay-locked loop circuits with hierarchical delay adjustment
Fine tuned signal phase adjustments are provided by multiple cascaded phase mixers. Each phase mixer outputs a signal having a phase between the phases of its two input signals. With each...
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6906560 |
Phase-continuous frequency synthesizer
A digitally controlled frequency synthesizer has a first direct digital synthesizer that generates a first phase-coherent, time-varying frequency, and a second direct digital synthesizer that...
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6891423 |
Quadrature switching mixer with reduced leakage
A quadrature switching mixer is provided for mixing a received RF signal and a local oscillator signal, while rejecting an image signal associated with the RF signal. Input signal components in...
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6882194 |
Class AB differential mixer
A differential mixer including at least two input/output stages, each stage including two identical branches, each branch of one of the two stages including at least two bipolar transistors the...
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6867625 |
Method and apparatus for high frequency digital carrier synthesis from plural intermediate carrier waveforms
A signal synthesizer according to the present invention produces a high speed or high frequency carrier waveform without employing an ASIC or FPGA operating at a sampling rate of greater than twice...
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6812769 |
Switched charge multiplier-divider
The switched charge multiplier-divider according to the present invention is constructed of CMOS devices. Capacitor charge theory is employed to implement the circuit of the switched charge...
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6810242 |
Subharmonic mixer
A subharmonic mixer and a method of downconverting a received radio frequency signal is described. The subharmonic mixer of the present invention uses two stacks of switching cores with high order...
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6810240 |
Analog multiplier
The analog multiplier has a MOS input stage. This makes it possible to increase the linearity range of the multiplier. In a development, a cascode circuit having an additional pair of bipolar...
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