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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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6633200 |
Management of internal signal levels and control of the net gain for a LINC amplifier
An amplifier subsystem has a modulator to generate a pair of constant amplitude phase-modulated components which are in response to an input signal, a pair of channels that include a pair of power...
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6621367 |
Signal power dynamic range compressing circuit and power amplifier using the same
In an input signal power dynamic range compressing circuit, an input signal is distributed by a directional coupler to a linear signal transfer path and a compressing signal generating path, and in...
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6611173 |
Miller effect-based circuit for splitting poles
A circuit for splitting poles between a first stage and a second inverting voltage-amplifier stage of an electronic circuit, comprises, in series between the output of the first stage and the...
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6593811 |
Nonlinear feedback linearizer
The present invention relates generally to an amplifier such as that with the radio frequency (RF) spectrum having a nonlinear feedback loop to cancel out distortions in the input signal, and...
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6590451 |
RF amplifier with feedback based linearization
A complex baseband model of the power amplifier within a DSP domain is used to develop a feedback signal that would be equivalent to the optimum negative feedback used for the analog amplifier....
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6590448 |
Operational amplifier topology and method
A technique is disclosed which facilitates the layout of op amp cells, for example, two-stage op amp cells or three-stage op amp cells, to provide larger operational amplifiers. In accordance with...
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6577189 |
Scheme for reducing transmit-band noise floor and adjacent channel power with power backoff
A bandpass amplifier for use in a communication system is described. The amplifier includes first and second first-order filters, first and second multipliers, a quantizer, and a driver. In one...
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6573790 |
Wide-bandwidth operational amplifier
An operational amplifier (opamp) [ 74 ] coupled in a negative-feedback configuration [ 82] [84 ] comprising a driving opamp [ 76 ]; a linear controller [ 78 ]; and a mechanism [ 80 ] controlling...
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6556079 |
Distortion compensating device and method for compensating distortion
A distortion compensating device which can significantly remove residual distortion, in which a value of matching circuit 11 is set up so that the distortion generated at a gain controlling unit 9...
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6535060 |
System and method for noise and spurious supression in power amplifier systems
An amplifier system including a vacuum tube amplifier having an input signal terminal and an output signal terminal, wherein the vacuum tube amplifier is for amplifying an input signal supplied to...
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6525605 |
Power amplifier system having frequency and amplifier failure compensation
A power amplifier system for use in amplifying an RF input signal exhibiting a given operating frequency within a known range of frequencies. The system includes a signal modulator that receives...
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6515540 |
High order multi-path operational amplifier with output saturation recovery
An amplifier is disclosed including multiple integrator stages. The amplifier includes a low-frequency path from a signal input to a signal output and relatively higher-frequency bypass paths...
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6489846 |
Distortion compensating device and distortion compensating method
An amplitude compensator utilized in a distortion compensating device which compensates non-linearity in amplitude and phase of an input-output characteristic of a high frequency power amplifier...
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6486740 |
Method and system for dynamic compensation
One aspect of the invention is an integrated circuit ( 10 or 110 ) comprising an amplifier ( 11 or 111 ) having at least two poles in its frequency response and an output impedance compensation...
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6445249 |
Modification of phase component of error signal to reduce variation of phase component of output signal of power amplifier
System ( 100 ) is coupled with power amplifier ( 106 ). Generation component ( 166 ) generates error signal ( 110 ) based at least in part on an input signal ( 144 ) for the system ( 100 ). The...
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6429741 |
Circuit for detecting distortion in an amplifier, in particular an audio amplifier
An amplifier having an input; an output supplying an output signal, and a feedback network connected between the input and the output, and a distortion detection circuit. The feedback network...
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6392478 |
Amplification device having an adjustable bandwidth
The invention relates to a device for amplifying electronic signals, including: an amplifier PRA, and a plurality of feedback loops G 1, G 2 placed between the output and the input of the...
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6388516 |
Precision high speed magnetic coil driver circuit
Accuracy of correction of offset drift with temperature and noise are corrected in a high voltage, high current amplifier is improved by thermal isolation and/or temperature regulation of another...
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6373332 |
Biquad notch filter
When using an operational amplifier having a small gain-band width product, in order to obtain a circuit having deep notch characteristics, a biquad filter includes first and second stages having...
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6356149 |
Tunable inductor circuit, phase tuning circuit and applications thereof
A tunable inductor circuit and phase tuning circuit utilizing a tunable inductor circuit for dynamically controlling signal phase delay in RF/Microwave Circuits and related applications. The...
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6353366 |
Bandwidth enhancement of transimpedance amplifier by capacitive peaking design
A bandwidth enhancement method by adding a peaking capacitor to a transimpedance amplifier for creating peaking effect is to add a peaking capacitor to a transimpedance amplifier for obtaining an...
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6297697 |
Methods and apparatus for noise shaping a mixed signal power output
A signal processing circuit and method for processing an input signal are described. The circuit includes a frequency selective network, an amplification stage, and at least one continuous-time...
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6288606 |
Linear power amplifier arrangement and method for its operation
A linear power amplifier arrangement is used for providing a selectable amount of amplification to a radio frequency signal to be amplified. The arrangement comprises a first parallel amplifier...
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6278331 |
System and method for compensating wafer parameters
The present invention relates to a system and method for compensating IC parameters. According to an embodiment of the present invention, a die of an IC wafer is coupled with a compensation circuit...
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6268768 |
Amplifier having linear characteristics
An amplifier system includes an input circuit loop and an output circuit loop coupled to a balanced amplifier assembly. The balanced amplifier assembly provides both a nonlinear distortion signal...
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6255905 |
Active filter circuit having a T-network input arrangement that provides a high input impedance
A filter circuit is provided that provides an input impedance arrangement with a high impedance value, which can be fabricated on a semiconductor body with a high accuracy and with a minimal...
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6252456 |
Power amplifier load controller and method for controlling a power amplifier load
The present invention addresses the need for an apparatus and method for controlling the load of a PA, to improve PA efficiency in linear transmitters with isolator elimination (IE) circuitry, that...
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6232834 |
Calibrated compensation for an operational amplifier
In this invention an integrated operational amplifier is calibrated to optimize phase margin. The calibration is done to correct changes caused by operating temp and supply voltages as well as...
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6208206 |
Frequency compensation techniques for low-power multistage amplifiers
A three stage amplifier is disclosed provided with a novel frequency compensation technique. Only a single feedback loop with a single compensation capacitance is provided. Instead of a...
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6201442 |
Amplifying circuit
An amplifier is provided for audio or instrumentation applications which exhibits radically improved performance over existing amplifiers of comparable cost. In a preferred embodiment, the...
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6188277 |
Power amplifier having monitoring and circuit protection
A power amplifier system is presented for amplifying an RF input signal. The system includes a vector modulator for receiving and modifying an input signal and providing therefrom a modified...
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6147555 |
Amplification system having mask detection
A method and apparatus reduce the out-of-band frequency components of an RF amplified signal, preferably a CDMA signal, which has a carrier frequency which is not known in advance. The apparatus...
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6091298 |
Linear amplifier arrangement
This invention relates to high power linear amplifiers. A high power linear amplifier is disclosed for communications such as CDMA communication systems. Linear amplifiers as used in communication...
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6081157 |
Tuning circuit
A tuning circuit which has a wide tuning bandwidth. The tuning bandwidth of the tuning frequency can be easily changed. The tuning circuit 1 is composed of two cascade-connected tuning amplifier...
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6072824 |
Circuit arrangement for reducing intermodulation in a bandpass filter system
A circuit arrangement that reduces selected intermodulation. The circuit arrangement includes a signal amplifier coupled to a bandpass filter via an electrical path. Signal energy outside the...
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6057735 |
Amplifier for continuous high gain, narrowband signal amplification
An apparatus and method to obtain a high Q, narrowband active filter with high gain suitable for an integrated circuit implementation. The high Q is achieved via active feedback with an amplitude...
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6037836 |
Switched-capacitor amplifier circuit
A switched-capacitor amplifier circuit produces accurate output signal even if the input signal varies rapidly at every sampling phase. Two capacitors having the same capacitance are connected, in...
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6031420 |
Operational amplifier arrangement
An operational amplifier arrangement includes besides the two-stage operational amplifier, a third stage for tracking and holding the input offset of the first stage during an offset compensation...
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6002299 |
High-order multipath operational amplifier with dynamic offset reduction, controlled saturation current limiting, and current feedback for enhanced conditional stability
An amplifier is disclosed including at least three integrator stages connected to provide a low-frequency path from a signal input to a signal output, and a relatively high-frequency bypass path...
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5994956 |
Inductive-capacitive feedback compensation for amplifier systems
The present invention is a device for feedback compensation in amplifiers having at least one voltage gain stage wherein both capacitive and inductive components are used in conjunction with...
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5994952 |
Narrow band-pass interferometric filter having enhanced operational characteristics
A narrow band-pass interferometric filter for applying a response characteristic to an input signal to produce a filtered output signal. The filter is comprised of an inverting amplifier having an...
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5982233 |
Device and method for compensating phase distortion
The present invention relates to a method of compensating for the phase distortion that occurs in a power amplified output signal in response to the output power of a power amplifier. The invention...
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5966046 |
Large swing wide band programmable active filter
A wide-band, high-order, programmable video filter is implemented using transimpedance-based active integrators. An input voltage which may for instance represent a composite video signal is...
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5963088 |
Fully balanced analog circuit
Non-inverting input terminals of first and second operational amplifiers having the same characteristics are connected together. A first circuit is connected between the inverting input terminal of...
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5952878 |
Second order differential highpass filter
A second-order differential highpass filter constructed according to the present invention includes a difference amplifier and a feedback processing circuit. The difference amplifier includes an...
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5936463 |
Inverted amplifying circuit
An stable inverted amplifying circuit includes an odd number of CMOS inverters and a feedback capacitance. Balancing resistances decrease the inverter open gain and limit the gain of the entire...
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5929699 |
Integrated active integrator filter with compensated unity gain bandwidth
An active RC integrator filter with finite operational amplifier bandwidth can be compensated by biasing the operational amplifier input stage such that its transconductance becomes a function of...
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5884143 |
Spacecraft with paralleled amplifiers and redundancy
A spacecraft includes a plurality of paralleled RF amplifiers. Each paralleled power amplifier (206) includes a signal splitter (222) which produces two nominally equal-amplitude signals, and a...
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5880634 |
Wide band-width operational amplifier
Various circuit techniques to implement continuous-time filters with improved performance are disclosed. The present invention uses RMC type integrators that exhibit lower harmonic distortion. In...
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