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Document Title |
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7629847 |
Opposing currents differential amplifier
An opposing currents (OC) differential amplifier is disclosed that eliminates headroom constraints and other problems associated with conventional differential pair amplifiers with current source...
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7535300 |
Operational amplifier
An operational amplifier and use of an operational amplifier is provided that includes an input differential amplifier, which is connected to a first input and to a second input and a differential...
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7489193 |
Operational amplifier
A disclosed operational amplifier includes: a pair of differential stages; a cascode amplifier stage; and an output stage. A threshold voltage of an output transistor constituting the output stage...
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7466199 |
Low noise amplifier with low current consumption
The invention relates to an amplifier circuit comprising supply terminals ( 12, 14 ) for supplying the circuit with first and second supply potentials (Vdd, Vss); a current path, which runs from...
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7449952 |
Amplifying circuit having a pull-up circuit and a pull-down circuit for increasing slew rate
An amplifying circuit includes an operational amplifier, a pull-up circuit and a pull-down circuit. The operational amplifier generates a first pull-up signal, a first pull-down signal and an...
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7411454 |
Electron turbulence damping circuit for a complimentary-symmetry amplification unit
An electron turbulence damping circuit ( 40 ) for a complimentary-symmetry unit ( 10 ′) includes a first output device ( 12 ′) having a first conductivity and a second output device ( 14 ′)...
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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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7352243 |
Voltage comparator circuit
A voltage comparator that realizes high-speed operation with a simple structure includes an input differential stage having a first differential pair and a second differential pair, into which a...
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7348850 |
Electronic circuit for amplification of a bipolar signal
Consistent with an example embodiment, there is an electronic circuit for amplification of bipolar symmetric current signals. The electronic circuit has a pair of complimentary current mirrors....
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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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7193425 |
Semiconductor test device
The present invention provides a semiconductor test device that can output a higher voltage as a driver output without increasing power consumption of a high-speed driver, so as to test a device...
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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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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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7091789 |
Output circuit
It is an object of the present invention to provide an output circuit capable of reducing a consumption current while an output current is suppressed in a case where limitation is placed on an...
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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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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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6982600 |
Class G-amplifiers
An output stage for a Class-G amplifier includes four current mirrors, (CmpL) powered by a first low voltage supply (VspL), (Cmph) powered by a first high voltage supply (Vsph), (CmmL ) powered by...
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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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6867621 |
Class AB digital to analog converter/line driver
A differential line driver includes first, second, third and fourth cascode transistors connected in parallel, wherein drains of the first and third transistors are connected to a negative output...
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6784736 |
Apparatus and method for indicating a difference between first and second voltage signals
An apparatus for indicating a difference between a first voltage and a second voltage includes: (a) an input unit for receiving the first voltage at a first locus and receiving the second voltage...
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6784738 |
Method and apparatus for gain control in a CMOS low noise amplifier
An amplifier comprising a Low Noise Amplifier (LNA) to amplify a Radio Frequency (RF) signal. The LNA having a transconductance and including an input stage to receive the RF signal. The LNA again...
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6782107 |
Method and arrangement for automatically controlling the volume in an audio signal reproduction device
An arrangement and a method for automatically controlling the volume in an audio signal reproduction device. A digital signal processing circuit, which is arranged in the audio signal path for...
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6741133 |
High output amplifier for stable operation
A high output amplifier includes a comparison amplifier having a first input, a second input, and an output, wherein a set voltage is applied to the first input, a voltage of the output is coupled...
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6714076 |
Buffer circuit for op amp output stage
An op amp includes a pair of buffer amplifiers interposed between the current switch and the output transistors in an output stage based on the Monticelli architecture. The buffer amps buffer the...
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6710660 |
Class B power buffer with rail to rail output swing and small deadband
A circuit is arranged as a class B amplifier with a rail-to-rail output swing and a small deadband. The circuit has two parallel input stages that each use an amplifier configured as a unity gain...
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6657496 |
Amplifier circuit with regenerative biasing
An amplifier having an improved output current drive capability includes an input stage and an output stage. An input of the output stage is operatively coupled to an output of the input stage. The...
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6642790 |
Differential, complementary amplifier
A differential amplifier has two amplifier paths. The second amplifier path is operated in the opposite direction relative to the first amplifier path. The outputs of the two amplifier paths form a...
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6630866 |
High beta output stage for high speed operational amplifier
The present invention provides an high beta, high speed operational amplifier output stage ( 100 ). The advantages of the operational amplifier output stage over conventional methods disclosed is...
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6586998 |
Output stage and method of enhancing output gain
The present invention provides for an output stage which couples with an input stage and is configured to limit a reflection current which is reflected back into the input stage to enhanced an...
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6552613 |
Output stage amplifier with compensation circuitry
An output stage amplifier circuit in accordance with the present invention overcomes many shortcomings of the prior art. A output stage amplifier circuit for providing a high output voltage and...
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6542032 |
Extremely linear, high speed, class AB rail to rail bipolar amplifier output stage with high output drive
The amplifier output stage circuit includes: a translinear loop 30 having first and second input nodes Vin+ and Vin−; a first transistor Q 7 coupled between a first output node of the...
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6538514 |
Compensation method in a class-G amplifier output stage
An improved class-G amplifier (FIG. 2 ) is provided by adding a first capacitor ( 82 ) between the input of current mirror ( 18 ) and node p, and by adding a second capacitor ( 84 ) between the...
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6535062 |
Low noise, low distortion, complementary IF amplifier
Arrangements of Class AB (push-pull) amplifiers, one in a higher voltage configuration and one in a lower voltage configuration, to achieve a high intercept at low power as well as a low noise...
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6535063 |
Drive method for a cross-connected class AB output stage with shared base current in pre-driver
The present invention provides technical advantages as a class AB output driver ( 400 ) with minimal cross-over distortion. If the differential input to the driver is I+δI/2 and I−δI/2, then...
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6501334 |
Actively biased class AB output stage with low quiescent power, high output current drive and wide output voltage swing
A class ‘AB’ amplifier output stage has an active current bias source that provides base drive current to the output transistors that is proportional to the signal input voltage level. The...
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6496068 |
Multi-stage amplifier circuit
An amplifier circuit that includes an amplifier stage and an output stage, and local feedback between these stages to drive a biasing string associated with the amplifier stage using the potential...
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6452451 |
Method for adjusting a bipolar output stage for improved frequency response
A method for adjusting the output response of a complementary bipolar operational amplifier includes: providing a first bipolar transistor 14; providing a second bipolar transistor 16 coupled...
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6429744 |
Method for bias rail buffering
A bias rail buffer circuit and method in accordance with the present invention overcomes many shortcomings of the prior art. A bias rail buffer circuit for providing a reference signal is suitably...
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6424220 |
Single-ended push-pull amplifier circuit
A first amplifying transistor is connected between a first supply terminal and an output terminal, the latter being grounded via a loudspeaker system, and another such transistor between a second...
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6420933 |
Low distortion current-to-current converter
A current-to-current impedance converter re-circulates the driver transistor collector current back into the output current path to generate an error current that has two portions including a DC...
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6380808 |
Push-pull amplifier circuit with idling current control
A push-pull amplifier circuit includes a push-pull output circuit having a P-channel FET 11 and an N-channel FET 10 connected in series between supply potentials VDD and VSS, a gate potential...
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6353362 |
Resonance free complementary bipolar output stage
An output stage of a complementary bipolar operational amplifier includes: a first bipolar transistor 14 ; a second bipolar transistor 16 coupled to the first bipolar transistor 14 ; a third...
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6281752 |
Amplifier with improved, high precision, high speed and low power consumption architecture
In an amplifier with improved, high precision, high speed and low power consumption architecture, comprising an input stage (1), an intermediate stage (2) and an output stage (3), the intermediate...
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6268769 |
Operational amplifier
An operational amplifier includes a differential amplifier stage having positive and negative input terminals formed by a pair of differential amplifier circuits, a current mirror stage having a...
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6184750 |
Control circuit driven by a differential input voltage and method for controlling same
The present invention teaches a variety of output stages for amplifying high speed signals while keeping distortion low and using a low supply voltage. The invention includes the use of dual...
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6166603 |
Class-ab output stages with improved distortion performance
The present invention teaches output stages having distortion performance improved relative to prior art class-AB output stage distortion performance. The general concept is to constantly bias the...
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6160451 |
Operational amplifier output stage
The present invention is directed to a buffer stage for buffering and isolating a signal source from an external load. The stage has a signal input terminal for receiving an input signal from said...
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6104248 |
Audio amplifier with tracking power supply utilizing inductive power converters
Disclosed is an audio amplifier with a tracking power supply that uses inductive power converters to provide positive and negative amplifier operating potentials of a magnitude that exceeds the DC...
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6097254 |
Output power amplifier circuit with short-circuit protective function
A load short-circuit protective circuit device having broad protective operation range and capable of maintaining protective operation until short-circuit of output transistors is released (reset)...
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6069534 |
Balance photo-receiver with complementary HBT common-base push pull pre-amplifier
A balanced photoreceiver which includes one or more photodiodes coupled to an amplifier that includes a common base configured input stage which operates over a frequency band from DC to millimeter...
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