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7616057 |
Nested transimpedance amplifier
A differential transimpedance amplifier circuit comprises a first operational amplifier having a first inverting input, a first non-inverting input, a first inverting output and a first...
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7605649 |
Nested transimpedance amplifier
A transimpedance amplifier comprises a first operational amplifier having an input and an output. A second operational amplifier has an input and an output that communicates with the input of the...
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7489188 |
Input matching apparatus and method for power amplifier using delta-sigma modulated signal
An apparatus and method amplifies a delta-sigma modulated signal and delivers the amplified signal to a power amplifier without distortion in a communication system. The apparatus receives a...
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7456688 |
Signal extraction circuit and distortion-compensated amplifier incorporating the same
To cancel a reflected wave reflected from a connecting portion ( 22 ) and leaking into a feedback signal when a non-matched component is connected, the reflected wave is extracted by a circulator (...
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7423484 |
Adaptive predistortion for a transmit system with gain, phase and delay adjustments
Systems and methods relating to the provision of gain, phase and delay adjustments to signals to be used by a predistortion subsystem. A portion of an input signal is delayed by delay elements...
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7409193 |
Predistortion circuit for a transmit system
Systems and methods related to amplifier systems which use a predistortion subsystem to compensate for expected distortions in the system output signal. A signal processing subsystem receives an...
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7405616 |
Nested transimpendance amplifier
A differential transimpedance amplifier circuit comprises first, second, third and fourth operational amplifiers having a first inverting input, a first non-inverting input, a first inverting...
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7403068 |
Method for double sampling loop negative feedback and double sampling negative feedback amplifier
A method for double sampling loop negative feedback comprising: obtaining a low-frequency feedback signal from the output of the amplifier; obtaining a high-frequency feedback signal from part of...
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7346100 |
Estimating gain and phase imbalance in upconverting transmitters
Estimation of gain and phase imbalance of an upconverting transmitter. A transmitter transmits symbols containing vector components of pre-specific relationship in an analog signal. A receiver...
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7323854 |
Zero cancellation in multiloop regulator control scheme
Control loops in a voltage regulator can be stabilized using minimal silicon area. A current limit signal, generated by a current limit control loop in the voltage regulator, can be divided to...
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7317353 |
Amplification device
An amplifier apparatus in which a signal is amplified by an amplifier and distortion produced by the amplifier is compensated for, that can continue to operate even in cases where the amplitude of...
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7305041 |
Peak suppression of multi-carrier signal with different modulation
A technique for peak suppression, phase and amplitude equalizer of multi-carrier signals with different modulation is described. The input to the multi-carrier power amplifier is modified by a peak...
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7298205 |
Amplifier and frequency converter
An amplifier circuit amplifies a signal inputted from an input terminal. A first feedback circuit is placed across an emitter of a bipolar transistor and an input of the amplifier circuit. A second...
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7295066 |
Adaptive predistortion for a transmit system
Systems, methods, and devices relating to the provision of deliberate predistortion to an input signal to compensate for distortions introduced by an amplifier subsystem. An input signal is...
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7295062 |
Pulse modulated power converter
A pulse modulation power converter comprising a forward path including a forward block ( 15 ), a switching stage ( 11 ) for amplifying an output from the forward block, and an output filter ( 12 )...
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7250815 |
Amplifier distortion management apparatus, systems, and methods
An apparatus and a system, as well as a method and an article, may include detecting an indication of an amplifier output signal amplitude and responsively adjusting the amplifier input signal...
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7242247 |
Distortion compensation circuit, power amplifier using distortion compensation circuit, and distortion compensation signal generating method
A distortion compensating circuit for a power amplifier attains raised compensating accuracy with shorter convergence time by accurately and quickly generating a distortion compensation signal for...
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7230484 |
RF signal amplifier unit, RF signal transmission device and RF signal transmitting terminal-antenna
An RF signals amplification block receives a first RF signal, and comprises means of amplification of this first RF signal so as to deliver a second, amplified, RF signal. This signal must be...
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7221218 |
MOSFET amplifier having feedback controlled transconductance
A signal is applied to the body of a MOSFET to enhance the transconductance of the MOSFET. The signal applied to the body of the MOSFET has essentially the same waveform as an input signal supplied...
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7209000 |
Frequency stabilization of chopper-stabilized amplifiers
Frequency stabilization of chopper-stabilized amplifiers using multipath hybrid double-nested Miller compensation. The compensation may provide a desired 6 dB/oct roll off for both instrumentation...
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7176757 |
Multistage amplifying devices, and reception device and transmission device using the same
A multistage amplifying device for amplifying a desired signal comprise first to N-th amplifiers connected in cascade,wherein the k-th (k is 1 to N) amplifier includes a k-th amplification section;...
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7173486 |
Nested transimpedance amplifier with capacitive cancellation of input parasitic capacitance
A nested transimpedance amplifier (TIA) circuit comprises a zero-order TIA having an input and an output. A first transconductance amplifier has an input that communicates with said output of said...
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7173485 |
Phase-compensated filter circuit with reduced power consumption
A filter circuit includes a plurality of integrator stages, each stage including a voltage-to-current converter to convert an input voltage into a current supplied to an output thereof and a...
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7154330 |
Stability compensation for adjustable gain amplifier
Stability compensation for an amplifier with adjustable gain is provided via adjustable capacitance coupled to an input of a gain element within the amplifier. Gain of the amplifier is adjusted by...
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7151405 |
Estimating power amplifier non-linearity in accordance with memory depth
Reducing a non-linearity effect of a power amplifier includes receiving signals at off-line inverse and forward models. The signals include an input signal, a pre-distorted signal, and an output...
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7142831 |
Crest factor reduction and amplitude pre-distortion for multi-carrier signals
A technique for Crest Factor reduction and amplitude pre-distortion of multi-carrier signals is described. The input to the multi-carrier amplifier is modified by a Crest Factor reduction and...
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7132885 |
Low phase shift implementation of the baseband circuitry of a Cartesian feedback loop
A circuit is provided that includes a Cartesian feedback loop. The Cartesian feedback loop includes one or more operational amplifiers. At least one of the operational amplifiers includes two or...
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7110718 |
Phase distortion using MOS nonlinear capacitance
RF phase distortion circuits and methods for controllably phase distorting an RF signal based on amplitude of the RF signal. An MOS device is provided having a body of a first conductivity type and...
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7078967 |
Control of bias voltage
The invention concerns a method for maintaining an optimal operating point of an LDMOS device stable, said LDMOS device producing an output signal including an error signal component. The method...
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7061313 |
Dual feedback linear amplifier
A dual feedback topology imparts stability to a multistage linear amplifier, particularly by improving overall amplifier phase margin at higher signal frequencies. With dual feedback, an inner...
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7034613 |
Adaptive predistortion for transmit system with gain, phase and delay adjustments
Systems and methods relating to the provision of gain, phase and delay adjustments to signals to be used by a predistortion subsystem. A portion of an input signal is delayed by delay elements...
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7031690 |
Polyphase filter with low-pass response
A complex low-pass filter that reduces the influence of component mismatch. The filter includes a first filter section for effecting a first single pole transfer function and a second filter...
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7009447 |
Outphasing modulator
Briefly, an apparatus having an outphasing modulator that may provide at least first and second outphased signals to a power amplifier. The outphasing modulator may control amplitude of the first...
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7005918 |
Current-to-voltage converting apparatus and impedance measuring apparatus
A current-to-voltage converting apparatus connected to an element or a circuit having a first terminal connected to a signal source and comprising a feedback amplifier, which is connected to a...
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6989711 |
Sectional power/voltage/current limiter for a multi-phase amplifier
A power splitter receives power and has a first and second power output. The first power output is connected first power limiting section. A first matching circuit connects between an output of the...
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6909321 |
Active isolated-integrator low-pass filter with attenuation poles
The present invention provides an active low-pass filter system including a low-pass filter circuit and at least one frequency-rejecting network coupled to the low-pass filter circuit. The...
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6859097 |
Radio frequency feedback amplifier circuits
A radio frequency feedback amplifier circuit of high linearity within the range of frequencies with which the circuit is to be used includes a high gain amplifier incorporating a bandpass filter in...
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6847259 |
Amplifier
A signal to be amplified is provided in polar format comprising an amplitude component ( 210 ) and a phase component ( 212 ). The amplitude component ( 210 ) is used to bias the phase component (...
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6803812 |
Active filter
A low pass notch filter has a notch frequency close to ω o . In the notch filter, an output of an operational amplifier is fed back to an inverting input terminal thereof through a second voltage...
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6799020 |
Parallel amplifier architecture using digital phase control techniques
An improved method and apparatus for using parallel amplifiers to efficiently amplify an information signal are disclosed. The improved apparatus utilizes digital signal manipulation techniques in...
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6784731 |
System and method for reducing amplifier distortion using distortion feedback
An amplifier distortion reduction system obtains a distortion signal from the amplifier output and feeds the distortion signal back to the input side of the amplifier to cancel with the distortion...
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6750710 |
Distortion reduction
Phase shifting network ( 110 ) predistorts the input to non-linear amplifier ( 114 ) to counteract AM-PM distortion. The input signal is sampled at ( 116 ) and its amplitude is detected at ( 118 )....
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6734729 |
Closed loop power amplifier control
The invention includes an integrated circuit chip having a closed loop control module. The closed loop control module includes a power amplifier coupled to a feedback control circuit. The power...
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6731694 |
Isolator eliminator for a linear transmitter
An isolator eliminator for a linear transmitter receives a plurality of digital samples of an information signal and a drive signal sampled from a feedback loop at periodic time intervals and,...
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6727750 |
Amplifier stablilization
The present invention relates generally to the problem of linearization in electronic amplifiers, and more particularly to the problem of controlling phase shift in these systems. The invention...
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6703897 |
Methods of optimising power amplifier efficiency and closed-loop power amplifier controllers
A significant part of the cost of a base station in the cellular mobile radio system is the power amplifier. Thus it is desirable to maximise usage of a power amplifier and in particular to gain...
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6700522 |
Signal settling device and method
A method and device are configured for providing for both quick and accurate signal settling. A high accuracy component is configured in parallel with a high speed component. The high accuracy...
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6697436 |
Transmission antenna array system with predistortion
A predistortion system adaptively compensates for distortion introduced along one or more amplification chains of a power amplifier system. In one embodiment, the predistortion system includes a...
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6677820 |
Distortion compensation apparatus
A distortion compensation apparatus for compensating for the distortion occurring in an amplifier with high precision is provided. Distortion generating devices generate a distortion of amplitude...
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6639950 |
Method and arrangement for correcting phase error in linearization loop of power amplifier
A method and arrangement for correcting a phase error in a linearization loop of a power amplifier, the loop comprising an I/Q modulator ( 10 ), one or more delay-causing power amplifiers ( 13 ) to...
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