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7567122 |
Variable gain amplifiers systems and methods
A system for controlling gain in a polar loop is disclosed. Embodiments of the invention provide for a substantially constant gain tolerant of changes in supply voltage, ambient temperature, and/or...
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7557651 |
Dual transconductance amplifiers and differential amplifiers implemented using such dual transconductance amplifiers
Various systems and methods for signal amplification are disclosed. For example, some embodiments of the present invention provide differential amplifiers that include dual transconductance...
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7512387 |
Method and control system for controlling the output power of an RF amplifier system
A system for controlling a power supplied to a load from a radio frequency amplifier system includes a radio frequency signal generator adapted for generating a radio frequency signal, an amplifier...
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7391259 |
Power amplifier
Embodiments of the present invention comprise methods and devices for amplifying a signal by amplifying a first signal and by then amplifying a second signal only if the first signal exceeds a...
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7375584 |
Gain adjustment method, gain adjustment circuit, and optical disc device having same gain adjustment circuit
A gain adjustment circuit includes a gain varying device for varying the gain of an input signal; and a detection device for detecting a variable output signal of the gain varying device, wherein...
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7327190 |
Differential amplifier arrangement
Circuitry for use in a differential amplifier includes an input stage having a first differential amplifier and an offset compensation stage that includes at least one controllable current source....
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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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7230483 |
Negative feedback system with an error compensation scheme
A negative feedback system includes a first summation module for receiving a system input and outputting a first summation output. A first forward module is coupled to the first summation module...
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7157976 |
High frequency amplifier
A high frequency amplifier comprising a first trans-impedance amplifier, a second trans-impedance amplifier, a third amplifier, and a variant current source is provided. The first trans-impedance...
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7126417 |
Distributed gain network
A system and method for a distribution network is provided wherein cascaded power amplifiers with bypass switching are disposed along the branches of the network. The amplifiers may have an RF...
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7126414 |
Arrangement and method for controlling an amplifier circuit corresponding to energy uptake in the amplifier circuit
An amplifier circuit ( 1 ) is disclosed, wherein with a view to reducing the leakage power of the amplifier circuit ( 1 ) a current path ( 6 ) is provided between a first output terminal (A 1 ) and...
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7113744 |
Adaptive radio transceiver with a power amplifier
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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7088975 |
Automatic gain control system and method using multiple local AGC loops
A receiver comprises a first Variable Gain Amplifier (VGA) that amplifies an input signal in accordance with a first gain to produce a first amplified signal. The first gain is controlled based on...
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7068099 |
Power amplifier module with distortion compensation
The invention relates to a power amplifier module comprising a first amplifier 2 having a first front-end 4 and a first backend amplifier stage 5 and a second amplifier 3 having a second...
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7053706 |
High linearity doherty communication amplifier with bias control
The present invention relates to bias control of a power amplification circuit of a mobile device for improving the efficiency and the linearity properties of the power amplifier. In one...
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7002410 |
Adaptive linearization technique for communication building block
The present invention is directed to a linearization apparatus and method. Preferred embodiments according to the present invention can combine an auxiliary non-linear block to a functional block...
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6784750 |
Transimpedance amplifier with selective DC compensation
A transimpedance amplifier selectively activates DC compensation to optimize a signal-to-noise ratio for an optical receiver. The optical receiver includes a photodiode that converts a light signal...
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6747517 |
Power-shifting rf amplifiers
Apparatus ( 70, 80, 90 ) and method are provided for selectively proportioning, or hot-switching, rf power to a plurality of rf outputs. The method includes: splitting a single rf signal into a...
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6605992 |
Offset error in linear feedback loops corrected by loop replication
A system of connecting errors in the control loop using multiple additional loops. A first loop carries out control in a desired way, and the additional loops are provided for the purpose of...
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6590447 |
Precision bridge amplifier
A bridge amplifier includes a first input node connectable to a power source having an input voltage, a second input node connectable to a control source having a control voltage, and a first and a...
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6577198 |
Active power splitter with impedance matching
A single-input/multiple output power splitter having internal feedback circuitry. A separate amplifying circuit, such as a transistor, is used to drive each of the outputs. The transistors may be...
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6326841 |
Method and apparatus for compensating for loss or RF output power from the isolation port of a hybrid coupler
A power amplifier system for amplifying RF signals includes an RF signal feedback arrangement to compensate for the loss of RF output power from isolation ports of hybrid couplers in the system and...
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6307434 |
Circuit for ensuring full saturation of amplifiers of a single input configured bridge amplifier
A circuit for ensuring a complete saturation of both operational amplifiers of a single-input bridge amplifier is provided. A voltage divider is connected between the inverting inputs of the two...
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6304138 |
Audio-frequency power amplifier that utilizes a bridged amplified configuration
An audio-frequency power bridged amplifier operates without a negative rail when responding to non-negative input signals, e.g. input signals ranging from zero to five volts. The amplifier also...
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6160446 |
Balanced differential amplifier without common-mode feedback circuit
An integrated circuit comprising a balanced differential amplifier. The balanced differential amplifier has a first single-ended differential amplifier coupled at a first negative differential...
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6097245 |
Differential output amplifier arrangement and method for tuning the output impedance of a differential output amplifier
A differential output amplifier arrangement (DOA) including two operational amplifiers (OA1,OA2), each having a feedback resistor (R2,R20), and which are coupled by a first resistor (R1) between...
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6091294 |
Amplifier circuit
An amplifier circuit for amplifying an input signal and outputting the amplified signal includes a first amplifier for outputting from a first output terminal a current proportional to a difference...
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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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5923206 |
Charge injection cancellation technique
An MOS FET circuit with a summing circuit at the input of an amplifier to provide charge cancellation. The summing circuit is capacitively coupled to the input with a charge cancellation capacitor....
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5903189 |
High gain low distortion bridge amplifier with feedback
A bridge amplifier circuit comprising two amplifiers in bridge configuration having a feedback path from the output of one of the amplifiers to the reference input of the other amplifier, together...
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5880633 |
High efficiency power amplifier
A high efficiency power amplifier 600 consists of a non-linear radio frequency (RF) Doherty power amplifier (67) and a linearization circuit, such as, for example, a Cartesian Feedback circuit...
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5861778 |
Low noise amplifier structure
A low noise amplifier structure based on a Differential Difference Amplifier (DDA1) having a differential output (outp, outn) and two differential pairs of input terminals (N1, P1; N2, P2). The...
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5834973 |
Voltage isolation circuit for a measurement channel
A voltage isolation circuit having an improved method of combining the HF path and LF path is provided. The LF path comprises an opto-isolator to achieve voltage isolation of the input signal while...
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5828267 |
Amplifier
In an amplifier which generates an output voltage which is proportional to an input voltage and can be picked off between the outputs of two push-pull output stages and has peak-to-peak values of...
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5771319 |
Network for influencing signal fields
The invention relates to analog circuits which are constructed as fed-back amplifier networks. The networking is implemented such that the output values of the individual amplifier elements are fed...
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5712591 |
Parallel preamplifier and equalizer
A preamplifier for processing an audio signal includes an equalizing and amplifying circuit comprised of parallel operational amplifiers, each with a feedback impedance circuit and an adjustable...
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5663682 |
Wide bandwidth combiner-amplifier
A combiner-amplifier is provided which has first current feedback amplifier which amplifies a first received signal by a predetermined gain value. A second current feedback amplifier amplifies a...
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5650752 |
Amplifier circuit with parallel connected amplifiers
An amplifier circuit has a wide frequency range which is broader than the frequency range expected from its circuit parameters. The amplifier circuit comprises a plurality of unit amplifier...
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5625320 |
Differential preamplifier and pre-emphasis network
A preamplifier and pre-emphasis network is provided having a differential plifier exhibiting common mode noise rejection. The preamplifier is particularly suited for use with a double-sided sensor...
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5621352 |
Self-configurable, dual bridge, power amplifier
A self-configurable, dual bridge, power amplifier has a window comparator sensing the level of input signals fed to the amplifier which-drives a plurality of configuring switches capable of...
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5610555 |
Low-voltage driven, audio signal amplifying apparatus and a portable acoustic system using said apparatus
The apparatus includes output stage amplifiers for receiving the respective outputs of preamplifiers provided in correspondence to the left and right channels in a stereo system. Negative feedback...
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5543759 |
Audio amplification circuits
An audio amplification circuit includes a ganged pair of logarithmic potentiometers, each potentiometer of the pair having an input terminal, an output terminal, and a wiper terminal. The input...
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5486791 |
Programmable gain amplifier
A programmable gain amplifier including first and second gain elements are connected by an impedance selector which allows programmability of the gain of both gain elements. The impedance selector...
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5434538 |
Gain enhancement for amplifier using a replica amplifier
A main amplifier has an enhanced gain due to current injection from a replica amplifier which has a similar structure and feedback network to that of the main amplifier. The main amplifier has a...
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5399986 |
Isolated multi-output power amplifier
A multi-output power amplifier is disclosed. The amplifier is divided into two stages. A single voltage amplifier is used as an input amplifying stage and several current amplifiers are used as a...
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5327095 |
Method and circuit for increasing the output impedance of an inactive amplifier
A method and circuit for increasing the output impedance of an inactive amplifier is provided. The method and circuit allows an increased number of amplifiers to be coupled in parallel to a single...
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5315267 |
Composite differential direct-coupled instrumentation amplifier
A differential amplifier which utilizes a pair of wideband operational amplifiers as output stages for two differential output signals, a pair of high performance DC operational amplifiers to...
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5300893 |
Amplifier
An amplifier circuit for applying a voltage from a voltage source across a load having a frequency domain transfer function g(s), the circuit being composed of: a coupling member having a frequency...
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5287069 |
Constant-amplitude wave combination type amplifier
A constant-amplitude wave combination type amplifier includes a first amplifier outputting a first amplified output, and a second amplifier outputting a second amplified output. The...
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5227735 |
Technique to drive transformer coupled line amplifier
The invention relates to a circuit for driving a transformer coupled line amplifier. The present invention uses a high impedance differential negative feedback from the secondary of the transformer...
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