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7081792 |
Operational amplifier, line driver, and liquid crystal display device
An operational amplifier capable of offset cancel in a shorter period, as well as a line driver capable of shortening one horizontal period and a liquid crystal display device are provided. In the...
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7068105 |
Low-voltage differential amplifier
A low-voltage differential amplifier circuit is disclosed. The low-voltage differential amplifier circuit includes a first differential amplifier, a second differential amplifier and a summing...
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7057463 |
Differential amplifier with improved frequency characteristic
An amplifier for amplifying an input signal, having a plurality of amplifier stages each having a gain smaller than a target gain. The plurality of amplifier stages are connected in parallel and...
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7057460 |
Differential amplifier with adaptive biasing and offset cancellation
A differential amplifier with adaptive biasing and offset cancellation is disclosed. In one particular exemplary embodiment, the differential amplifier may comprise a first electrical path...
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7053711 |
Multistage differential amplifier
The invention relates to a multistage differential amplifier circuit having a multistage differential amplifier which has an input stage and at least one output stage connected downstream of the...
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7046089 |
Variable gain amplifier
Disclosed is a CMOS variable gain amplifier. The variable gain amplifier comprises a first means for first and second differential input voltages, a second means for controlling its...
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7042317 |
High-frequency active inductor
An active inductor circuit implemented in sub-micron CMOS semiconductor technology is usable at gigaHertz frequencies and includes an input node, a non-inverting transconductor circuit comprising a...
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7034616 |
Operational amplification circuit, overheat detecting circuit and comparison circuit
In a circuit according to the present invention, a multi-collector transistor is provided which includes first to third collectors so that, when a current does not flow from the second collector, a...
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7030697 |
Method and apparatus for providing high common-mode rejection ratio in a single-ended CMOS operational transconductance amplifier
A method and apparatus for providing high common-mode rejection ratio (CMRR) in a single-ended CMOS operational transconductance amplifier is disclosed. A common-mode feedback boosts the OTA CMRR,...
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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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7023277 |
Method and system for minimizing differential amplifier power supply sensitivity
The invention includes an apparatus and a method for minimizing power supply sensitivity of a differential amplifier. The apparatus includes a current source providing a differential amplifier bias...
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7019590 |
Self-stabilizing differential load circuit with well controlled impedance
A circuit for providing a self-stabilizing, differential load circuit with well controlled impedance to an amplifier is described. According to one embodiment, two pairs of transistors in a...
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7015757 |
Transconductance amplifier with multi-emitter structure for current balance in a multi-phase regulator
A transconductance amplifier with multi-emitter structure for balancing current of a multi-phase regulator including multiple transistors, a bias current device, multiple current mirrors, and...
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7013118 |
High speed operational amplifier design
A radio receiver portion of a transceiver includes a differential amplifier that is used to provide a fast response. A pair of input MOSFETs of the differential amplifier stage are coupled to an...
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7005921 |
Common-mode feedback circuit
A common-mode feedback circuit is provided for fully-differential operational amplifier stages of a multistage amplifier. A first stage of the circuit establishes a substantially constant current...
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6980055 |
CMOS differential buffer circuit
The present invention pertains to a MOS type differential buffer circuit. The buffer proposed herein utilizes capacitive coupling to apply small AC signals to an amplifying current source to...
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6980054 |
Trans-conductance amplification circuit, trans-conductance filter circuit, and filtering method
A trans-conductance filter circuit with an expanded cut-off frequency range is provided. The cut-off frequency of a trans-conductance filter circuit is changed by varying the current mirror ratio...
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6965266 |
High voltage differential amplifier using low voltage devices
A high voltage differential amplifier including an input differential pair of low voltage transistors, a sense differential pair of low voltage transistors, first and second high voltage...
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6965267 |
Bipolar differential input stage with input bias current cancellation circuit
A bipolar differential input stage with an input bias current cancellation circuit comprises an input pair and a bipolar tracking transistor. The input stage is arranged such that the collector...
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6963244 |
Common mode linearized input stage and amplifier topology
A common mode linearized input stage comprises NPN and PNP differential pairs biased with respective tail currents at respective common emitter nodes, with each pair connected to receive a...
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6933781 |
Large gain-bandwidth amplifier, method, and system
An amplifier includes multiple stages. Early stages of the multi-stage amplifier have low gain and preserve bandwidth.
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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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6924649 |
Sensor read out
A circuit and a method to measure continuously the resistance of variable resistors in series as e.g. potentiometers within a sensor, used for e.g. a joystick, has been achieved. The voltage across...
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6919767 |
Circuit arrangement for low-noise fully differential amplification
The invention relates to a circuit for low noise, fully differential amplification. A feedback signal ( 121 ) is detected in a differential output step of the differential amplification circuit by...
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6919766 |
Operational amplifier circuit
An operational amplifier circuit includes a first differential pair, which includes first and second transistors, and a second differential pair, which includes third and fourth transistors. A...
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6906586 |
Differential amplifier circuit used in solid-state image pickup apparatus, and arrangement that avoids influence of variations of integrated circuits in manufacture and the like
The output terminal of a first voltage-current conversion circuit, which includes operational amplifiers and a resistor, is connected to the output terminal of a second voltage-current conversion...
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6897726 |
Differential circuit, amplifier circuit, and display device using the amplifier circuit
A differential circuit comprises first and second differential pairs driven by constant-current sources, respectively, for receiving input voltages, first transistors, second transistors, and...
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6891437 |
Current amplifier structure
A circuit structure for performing current amplification. The circuit structure may be standardized as a current amplifier cell such that many types of applications requiring current amplification...
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6891433 |
Low voltage high gain amplifier circuits
In one embodiment, the present invention provides an amplifier circuit including a cascode input stage coupled to a differential stage. In another embodiment, an amplifier includes a differential...
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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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6870424 |
Low voltage differential in differential out receiver
A folded common cascode circuit with symmetric parallel signal paths from the differential inputs to a single ended output provides a low skew, low jitter, low power, high speed differential in/out...
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6856198 |
Amplifier and method for voltage-to-current conversion
An amplifier includes a differential unit including an input port to receive a voltage input signal, a current mirror unit including an output port, and a voltage-to-current conversion unit to...
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6850118 |
Amplifier circuit and power supply provided therewith
An amplifier circuit includes first and second resistors that are serially connected to each other between bases of first and second transistors that flow the same current as that in a differential...
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6847260 |
Low dropout monolithic linear regulator having wide operating load range
A monolithic low dropout regulator includes an active capacitor multiplier that is used to form the dominant pole of the regulator, thereby yielding stability. This decouples the system stability...
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6844781 |
Dual differential-input amplifier having wide input range
A dual differential-input operational amplifier that includes six PMOSFETs having their source terminals coupled to a high voltage. A seventh and eighth PMOSFET have their source terminals coupled...
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6838942 |
Efficient class-G amplifier with wide output voltage swing
Various embodiments of methods and apparatus for an amplifier with wide output voltage swing are disclosed. The amplifier may include multiple output stages, each associated with a distinct supply...
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6836186 |
AB class amplifier for controlling quiescent current
An AB class buffer amplifier controls quiescent current. The AB class buffer amplifier includes a first current controller and a second current controller. The first current controller sources...
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6831513 |
Differential amplifier
A differential amplifier includes a first diode having a first terminal and a second terminal wherein the first terminal is coupled to a voltage node and the second terminal is coupled to a first...
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6828855 |
Class AB operational amplifier with split folded-cascode structure and method
Bias current in output transistors of a class AB output stage is controlled by providing equal amplification to both an output of an input stage ( 2 ) of an amplifier and an output ( 17,18 ) of a...
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6822512 |
High gain amplifier with rail to rail range and frequency compensation
A high gain amplifier includes a differential amplifier stage having a pair of transistors; first and second input circuits for providing input signals to the pair of transistors; transistor means...
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6798292 |
Highly linear low voltage rail-to-rail input/output operational amplifier
An operational amplifier circuit includes: a first differential pair 20 of a first conductivity type having a first current branch and a second current branch; a second differential pair 22 of...
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6788146 |
Capacitor compensation in miller compensated circuits
A Miller-compensated amplifier circuit. The circuit includes an amplifier stage, and a compensation capacitor arranged in parallel with the amplifier stage. A current multiplier circuit path,...
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6784737 |
Voltage multiplier circuit
A voltage multiplier circuit includes a voltage-to-current converter, a current multiplier, and load devices. The voltage-to-current converter receives a differential input voltage, and produces a...
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6781460 |
Low power low voltage differential signal receiver with improved skew and jitter performance
A folder common cascode circuit with symmetric parallel signal paths from the differential inputs to the differential outputs provides a low skew, low jitter, low power differential amplifier. The...
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6778010 |
Amplifier slew-rate enhancement systems for use with switched-capacitor structures
High-speed differential amplifiers are provided for use with switched-capacitor structures. These amplifiers reduce current demand during small-signal operation and generate high slew currents...
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6774715 |
BiCMOS AC filter circuit
An alternating current filter circuit for a BiCMOS differential amplifier has a circuit that computes a base current of the BiCMOS differential amplifier and a circuit that generates an offset...
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6774721 |
High speed logic circuits
Quake Transistor Logic (QTL) circuits of the embodiments of the invention are low power, high-speed circuits that can be manufactured by the same process as the lower-speed complex circuits, and...
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6771126 |
Slew rate enhancement circuit and method
An apparatus for enhancing the slew rate of a differential amplifier capable of producing an output voltage and including a load stage, includes: a gain enhancement stage coupled to the load stage;...
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6762646 |
Modified folded cascode amplifier
A folded-cascode amplifier is arranged with a differential pair circuit, a current mirror circuit, and a cascode circuit. The differential pair is coupled to the current mirror circuit, while the...
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6756841 |
Variable offset amplifier circuits and their applications
A variable offset amplifier circuit includes two differential transistor pairs and a variable current generator coupled to each differential pair to control tail current. Each differential...
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