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7595690 |
Voltage-clamping device and operational amplifier and design method thereof
A voltage-clamping device used in an operational amplifier is provided. The operational amplifier comprises a first transistor. The cross-voltage between the gate and the source of the first...
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7595625 |
Current mirror
A current mirror includes at least a first and a second mirror transistors inserted between a first and a second voltage reference and connected to an input terminal and to an output terminal of...
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7583148 |
Transconductance control circuit, method of controlling transconductance, and a power amplifier
A transconductance control circuit, comprising: a test transconductance circuit for providing an output current from a reference voltage; apparatus for deriving a bias current for the test...
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7567628 |
Symmetric differential slicer
A self-biasing slicer includes a self-biased differential transistor pair. As a result of the self-biasing, the slicer may receive input signals without the use of AC coupling. That is, a...
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7557658 |
Low voltage amplifier having a class-AB control circuit
A low voltage amplifier having a class-AB control circuit which generates minimal or no surge current when the output of the amplifier clips to ground or the negative rail. The amplifier includes...
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7548114 |
Apparatus for slew rate enhancement of an operational amplifier
The present invention discloses an apparatus for slew rate enhancement of an operational amplifier, wherein an auxiliary control device and an auxiliary output device are added to the output stage...
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7545216 |
Amplifier with current mirror bias adjust
An amplifier includes a differential amplifier stage, a voltage amplification stage and a power output stage. The bias level of the output stage is proportional to current through the voltage...
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7539466 |
Amplifier with varying supply voltage and input attenuation based upon supply voltage
A radio frequency amplifier module ( 500 ) has a voltage monitor ( 546 ) that monitors an input supply voltage of an input power supply ( 534 ) and an adjustable power supply ( 512 ) that accepts...
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7538617 |
Class AB amplifier circuit with combined quiescent current and common mode control
It is an object of the present invention to provide an amplifier circuit that supplies a differential output signal (Voutp−Voutn) with a stable common mode potential (½×(Voutp+Voutn)) and a...
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7535305 |
Quiescent current detecting circuit for class AB amplifier
An operational transconductance amplifier is configured with an asymmetric output current capability. When current sunk from the output exceeds a rated load, the normally equal input voltages...
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7528661 |
Low quiescent current output stage and method with improved output drive
Circuitry for increasing the maximum output current magnitude of a diamond buffer (Q 57,58,74,75 ) having increased maximum output current provides a bias current of a first magnitude (I) into an...
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7528660 |
Power amplifier circuit and test apparatus
There is provided a power amplifier circuit that applies an output voltage according to a given input voltage to a load, the power amplifier circuit includes an amplifying section of which an...
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7505750 |
Mixer transconductance in RF transceiver
An integrated circuit radio transceiver and method therefor comprises circuitry that is operable to up-convert an outgoing continuous waveform signal to RF and that is further operable to...
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7411455 |
High output current buffer
A bipolar high output current buffer is disclosed using a negative feedback current mirror to supply the base drive to an output transistor. Small quiescent currents are used wherein the buffer...
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7405624 |
Class AB source follower
Various source follower circuits and methods for implementing such are disclosed. As one example, a class AB source follower circuit is disclosed that includes a source follower circuit that is...
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7405622 |
Operational amplifier with less offset
A differential amplifier includes an input stage circuit including a first differential pair and a second differential pair which are complementary to each other; a first current mirror circuit...
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7403072 |
Integrated circuit devices having a control circuit for biasing an amplifier output stage and methods of operating the same
An integrated circuit device includes an amplifier circuit that generates an output voltage. A bias control circuit is configured to generate a bias control voltage or the output voltage at an...
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7394316 |
High speed, high current gain voltage buffer and method
An amplifying circuit which may be useful in a diamond buffer amplifier or operational amplifier includes an input transistor including an emitter, a collector, and a base coupled to receive an...
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7372333 |
Monolithic supply-modulated RF power amplifier and DC-DC power converter IC
Embodiments of RF power amplifiers are disclosed that include switched-mode power amplifiers supplied by synchronous buck DC-DC converters. The switched-mode power amplifiers can be used to amplify...
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7362176 |
High efficiency linear amplifier
A linear amplifier is configured with a current-feedback amplifier followed by a voltage-feedback amplifier to drive a totem-pole output stage. The output stage includes a series arrangement of an...
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7304538 |
Accurate quiescent current control scheme in floating controlled class AB amplifier
Provided is an amplifier including a system for controlling output stage quiescent current. The amplifier includes a driving stage including first pmos and nmos transistors coupled together, and an...
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7298211 |
Power amplifying apparatus
A push-pull amplifier includes a pair of transistors, wherein each of the transistors has a control terminal, a first terminal, and a second terminal. A current that flows between the first...
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7271653 |
Amplifier with a voltage-controlled quiescent current and output current
An amplifier capable of controlling the magnitudes of quiescent and output current, using externally supplied voltages. The amplifier includes: an input circuit converting a voltage difference...
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7253685 |
Class AB amplifier having adjustable quiescent current and output current
A class AB amplifier capable of easily controlling the amount of quiescent current and the amount of amplifier output current. The amplifier includes an input circuit that transform a voltage...
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7224227 |
Apparatus and method for correction of error caused by reverse saturation current mismatch
A buffer circuit is arranged for offset cancellation between an input voltage and a buffered voltage. The buffer circuit includes two bias current sources, two p-type transistors, and two n-type...
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7199657 |
Amplification gain stages having replica stages for DC bias control
An amplification apparatus is provided that includes a plurality of gain stages including a first gain stage having first and second transistors and a second gain stage having third and fourth...
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7193459 |
Power amplifier control technique for enhanced efficiency
A power amplifier configuration including power amplifier circuitry and power control circuitry and having improved Power Added Efficiency (PAE) is provided. The power amplifier circuitry includes...
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7164317 |
Apparatus and method for a low-voltage class AB amplifier with split cascode
An op amp is arranged for low-voltage, rail-to-rail operation with a class AB output. The op amp includes a transconductance input stage, a folded cascode middle stage that includes a split...
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7135927 |
Ultra fast, low noise operational amplifier with dynamic biasing
The present invention achieves technical advantages as an operational amplifier ( 30 ) having both a high slew rate and a full power bandwidth with low distortion by providing resistors (R 6 , R 7...
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7113041 |
Operational amplifier
An operational amplifier that decreases idling current, widens a voltage output range, and increases load driving capacity. The operational amplifier includes a first output transistor connected to...
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7102440 |
High output current wideband output stage/buffer amplifier
A high output current wideband output stage/buffer amplifier that has reduced quiescent current requirements. The output stage/buffer amplifier includes a diamond follower circuit having a pair of...
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7091787 |
Transconductance amplifier with temperature sensitive current limiting
A transconductance amplifier generally limits its current output, and specifically decreases its current output as a function of temperature. The circuit is made up of an operational amplifier and...
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7078973 |
Bipolar rail-to-rail output stage
A bipolar rail-to-rail class-AB output stage that provides improved AC performance in low voltage applications. The bipolar output stage includes an input buffer stage, first and second...
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7030696 |
Differential amplifier and semiconductor device
A differential amplifier for amplifying an input signal at a constant amplification rate regardless of fluctuation in the center voltage of the input signal. The differential amplifier includes a...
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7009451 |
Image display apparatus and high voltage driver circuit
A driver circuit of an image display apparatus comprises driver circuit with a class A/B push-pull stage (T 3 , T 5 ). The driver circuit contains an n-type pull transistor (T 3 ), an n-type...
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7009450 |
Low distortion and high slew rate output stage for voltage feedback amplifier
A voltage feedback (“VF”) operational amplifier (“op-amp”) that includes a circuit operable to dynamically bias pre-driver transistors at the op amp output stage. This arrangement provides...
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6954105 |
Disk drive and error amplifier therefor and related methods
An amplifier may include an output stage including first and second output transistors, and a biasing stage for generating first and second biasing voltages at control terminals of the first and...
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6940353 |
High frequency power amplifier
A CMOS amplifier includes a CMOS inverter and a bias circuit coupled in a feedback loop between the output and input of the inverter. The bias circuit provides linear biasing so that the inverter...
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6933784 |
Output stage for high gain and low distortion operational amplifier
A class-AB MOS output stage that provides higher gain and significantly lower distortion. The class-AB MOS output stage includes a PMOS output transistor and an NMOS output transistor coupled...
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6922105 |
Operational amplifier
In an operational amplifier, a differential amplifying circuit is configured to amplify an input voltage inputted from the input terminal. An outputting transistor is connected to the output...
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6914486 |
System and method for improved bias matching
Systems and methods to improve bias matching (e.g., for a current feedback amplifier) are described. A compensation signal is combined with one or more bias signals to mitigate mismatch between the...
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6903610 |
Operational amplifying circuit and push-pull circuit
In an operational amplifying circuit, the first transistor is configured to turn on and off according to an output signal outputted from the operational amplifier through the output terminal...
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6903609 |
Operational amplifier
An operational amplifier that decreases idling current, widens a voltage output range, and increases load driving capacity. The operational amplifier includes a first output transistor connected to...
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6897729 |
Self-calibrating gain control circuit for low noise amplifier
An amplifier comprises a Low Noise Amplifier (LNA) that amplifies a Radio Frequency (RF) signal that includes a transconductance, a gain and an input stage that receives the RF signal. A bias...
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6882225 |
Multi-stage power amplifier for audio frequencies
The invention concerns a power amplifier consisting of three stages: a first feedback-free stage amplifying the input signal in current; a second stage amplifying in voltage the signal output from...
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6879213 |
Rail to rail class AB output for an amplifier
A circuit is used in the output stage of an operational amplifier which allows a rail to rail swing of the output voltage while consuming low quiescent power. The circuit includes first and second...
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6870426 |
Output stage, amplifier and associated method for limiting an amplifier output
A system and method for implementing an amplifier capable of limiting or clamping an amplifier output signal is described. A clamp buffer and an input buffer cooperate to bias an output circuit...
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6864747 |
Amplifier device with an adjustable operating-control
A device for amplifying an input signal comprising a semiconductor unit having at least one semiconductor component, and circuit for setting an operating point of the semiconductor unit. The...
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6842525 |
Signal amplification circuit and process for neutralizing noise from a power supply voltage
An amplification circuit is provided for the signal output from a microphone in which the signal is amplified by a differential structure amplifier. The circuit includes the pull-up voltage, which...
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6794943 |
Ultra linear high speed operational amplifier output stage
The present invention provides an ultra linear, high speed operational amplifier output stage ( 100 ). The advantages of the operational amplifier output stage disclosed is significantly higher...
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