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5889432 |
Two-stage differential microwave amplifier with bias current sharing and automatic gain control
A multi-stage differential amplifier includes first and second DC current paths with first and second stage amplification transistors included in each current path so that both stages share the...
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5886578 |
Differential amplifier including bias circuit with bias resistor
A differential amplifier receiving a first input signal and a second input signal, respectively, and amplifying voltage difference between the first and second input signals to output an output...
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5886579 |
Variable gain CMOS amplifier
A variable gain amplifier includes an input transconductor having a transconductance that is variable in response to a first control signal, an output circuit having a transresistance that is...
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5880627 |
Low power op-amp circuit with boosted bandwidth
A low-power op-amp circuit (70) having boosted bandwidth comprises a DC circuit block (72) which is coupled to first (V DC +, V DC +, V AC +) and second (V DC -, V AC ) input nodes and to an...
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5880638 |
Rail-to-rail operational amplifier and method for making same
Disclosed is an operational amplifier having a positive input terminal, a negative input terminal, an output terminal, a positive power supply input and a negative power supply input. The...
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5880637 |
Low-power operational amplifier having fast setting time and high voltage gain suitable for use in sampled data systems
An operational amplifier includes a differential amplifier including a first transistor (120) and a second transistor (122), a gain stage (125), a first folded cascode stage (104) and a second...
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5874840 |
Differential source follower with body effect compensation
An improved differential source follower with negligible input/output mismatch over a wide range of input signal magnitudes. A pair of FETs and current sources provides bias current control for...
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5872482 |
Amplifier circuit having a pair of differential transistors with differing threshold values for perform offset compensation
An amplifier circuit for analog-signal processing has an operational amplifier having an output, an inverting input, and supply inputs for accepting a single supply potential and a reference...
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5869999 |
Open loop pre-amplifier for an electronic measuring system
A fast, open-loop amplifier for an electronic measuring system is formed by a folded, differential, open-loop amplifier. This amplifier includes a differential common-source portion, a current...
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5864254 |
Differential amplifier circuit with enlarged range for source voltage and semiconductor device using same
A differential amplifier circuit includes a differential amplifier having inversion and non-inversion input terminals and input amplifiers each individually connected to one of these input...
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5864257 |
Replica bias circuit to optimize swing of differential op-amp
A replica circuit derived from the bias generating circuit for an amplifier. The replica circuit duplicates the operating point of the op-amp transistors, and generates two reference voltages. The...
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5854574 |
Reference buffer with multiple gain stages for large, controlled effective transconductance
A reference buffer suitable for driving switched-capacitor or resistive load circuits provides a very low output impedance. The reference buffer utilizes an amplifier with a very large and...
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RE36013 |
Differential charge pump circuit with high differential and low common mode impedance
A high gain, low voltage differential amplifier exhibiting extremely low common mode sensitivities includes a load element exhibiting a high differential resistance, but a low common mode...
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5847606 |
Low voltage CMOS amplifier output stage
A CMOS amplifier output stage including a complementary output MOSFET transistor pair whose channels are connected together in series between a supply voltage and a reference potential, and whose...
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5847600 |
Multi-stage high-gain high-speed amplifier
A two-stage switched-capacitor residue amplifier having novel circuitry in the first and second stages provides fast and accurate settling while configured with a large closed-loop gain, and also...
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5847598 |
Differential amplifier
This invention is directed to providing a differential amplifier that can increase voltage gain at low frequency and that can be applied in signal processing circuits of high accuracy. Such a...
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5841317 |
Differential amplifier circuit with a high through put rate and reduced power consumption
A differential amplifier achieving a high throughput rate with reduced power consumption includes a differential circuit, output circuit, a constant current source transistor, a drive transistor,...
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5838200 |
Differential amplifier with switched capacitor common mode feedback
A differential amplifier with switched capacitor common mode feedback includes a differential telescopic cascode amplifier in which the differential output terminals are individually coupled to a...
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5834974 |
Differential amplifier with reduced current consumption
A differential amplifier comprising a first NMOS transistor having its gate for receiving a first input signal, a second NMOS transistor having its gate for receiving a second input signal, a first...
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5831480 |
Operational amplifier adopted for input and output in wide ranges for driving a large load
An operational amplifier comprises an input stage, an output stage, and an intermediate circuitry connected between the input stage and the output stage. The operational amplifier may be biased...
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5825244 |
Low power class AB integrated circuit amplifier having improved linearity when driving high impedance loads
An amplifier circuit having four variable impedance nodes is provided. The amplifier has split transconductance current paths. Each half of the amplifier has two such current paths and each current...
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5825245 |
Compound cascode amplifier
A compound cascode amplifier comprising first and second FET input transistors, the gates of which are coupled to a differential input, and first and second FET cascode transistors. The sources of...
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5821809 |
CMOS high-speed differential to single-ended converter circuit
A CMOS differential to single-ended converter is implemented. A differential input stage comprised of a pair of N-channel transistors draws current through two fixed current P-channel load...
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5818295 |
Operational amplifier with stabilized DC operations
An operational amplifier with improved operational speed, as well as low power consumption, arranges a current mirror made of the pMOS transistors PT 17 and PT 18 in the stage after the...
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5812022 |
Differential amplifier circuit having low noise input transistors
A differential amplifier circuit whose noise is reduced when used in a CMOS operational amplifier without increasing its cost includes a differential input stage circuit in which gate lengths of...
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5812027 |
Spike insensitive intermediate frequency amplifier
The intermediate frequency (IF) amplifier (10) of the invention comprises a differential stage (40) having transistors (41, 42) serially coupled to inductive loads (31, 32). There is only one point...
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5808513 |
Rail-to-rail input common mode range differential amplifier that operates with very low rail-to-rail voltages
A rail-to-rail input common mode range differential amplifier operates on rail-to-rail voltages down to approximately one volt by utilizing one p-channel transistor to cover a first portion of the...
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5805021 |
High swing low power general purpose operational amplifier
An operational amplifier circuit is provided which includes: 1) a first folded-cascode gain stage having a differential pair of natural V T devices which are P-channel transistors; 2) a second...
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5789981 |
High-gain operational transconductance amplifier offering improved bandwidth
A high-gain, low-power transconductance amplifier suitable for use in switched-capacitor circuits provides improved accuracy and high-speed operation. The transconductance amplifier includes an...
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5789980 |
Amplifier and semiconductor device which are operated at a low voltage
An amplifier and a semiconductor device according to the present invention are operated at a low voltage and decreased in size and problems such as a noise and an oscillation phenomenon. The...
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5777514 |
Differential to single ended conversion technique for an operational amplifier having low input offset voltage, high speed and high gain
An operational amplifier having an input and an output stage. The input stage includes first and second source-coupled NMOS input transistors for accepting a differential input voltage and first...
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5760647 |
High bandwidth fast settling time operational amplifier and method therefor
A wide bandwidth fast settling operational amplifier (71) comprises a first stage (72) and a second stage (73). The first stage attenuates a differential input signal applied to the operational...
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5751186 |
Operational amplifier circuit with an extended input voltage range
An operational amplifier circuit 21 comprises transistors N14, N15 in a first output amplifier circuit 24, and transistors P24, P25 in a second output amplifier circuit 25. When a second...
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5748041 |
AGC amplifier circuit using triple-tail cell
At AGC amplifier circuit having a triple-tail cell including first, second and, third transistors whose emitter or sources are coupled together. The first and second transistors form a differential...
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5748040 |
Fully differential high gain cascode amplifier
A very high gain cascode amplifier includes a cascoded differential structure wherein a cascoded N-channel leg comprised of two series connected transistors (56) and (58) are connected between an...
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5745007 |
CMOS differential amplifier having constant transconductance and slew rate
An amplifier, particularly a CMOS amplifier has a differential input which is fed to six differential pairs. The outputs of the first and third differential pair are combined and fed to inputs of a...
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5739722 |
Low-voltage rail-to-rail operational amplifier
The op-amp circuit described herein utilizes current summing to substantially eliminate cross-over distortion. Therefore, the op-amp circuit is characterized by linearity over the operable voltage...
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5739721 |
High swing, low power output stage for an operational amplifier
A high swing, low power output stage for an operational amplifier is provided which includes: 1) a folded-cascode gain stage having a differential pair of natural V T devices, which are preferably...
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5736871 |
Differential pair input buffer circuit with a variable current source
In an input buffer circuit for use in a semiconductor integrated circuit, comprising a differential pair formed of a pair of MOS transistors and receiving a reference voltage and an input signal...
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5736885 |
Offset adjustment for fully differential amplifiers
A circuit for providing an input offset voltage to balance a fully differential amplifier may include two field effect transistors (FETs) in parallel conductive paths for receiving a current, an...
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5734297 |
Rail-to-rail input stages with constant g.sub.m and constant common-mode output currents
A rail-to-rail input stage with constant g m and constant common-mode output currents is provided. The common-mode output currents are controlled by the use of current switches. When low and high...
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5734298 |
FET amplifying circuit which can improve low-consumptive current
An amplifying circuit is suitable for an integrated circuit that has a characteristic of low-noise, high-gain, and low-consumptive current. In the circuit, transistors or FETs are used as...
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5734296 |
Low voltage operational amplifier input stage and method
Low voltage operational amplifier (10) operates in a voltage range of one to eight volts over a temperature range of 0° to 70° centigrade. Op amp input stage (12) uses N-channel depletion-mode...
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5731739 |
Class A operational amplifier with area efficient MOS capacitor frequency compensation
An operational amplifier with MOSFET's configured as capacitors provide frequency compensation over a large range of input frequencies is described. The operational amplifier has an differential...
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5729178 |
Fully differential folded cascode CMOS operational amplifier having adaptive biasing and common mode feedback circuits
An adaptive biasing circuit is combined to a fully differential cascode operational amplifier ("OP AMP") to eliminate the effect of a slew rate, thereby increasing the operation speed of the OP AMP...
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5722052 |
Switching current mirror for a phase locked loop frequency synthesizer and communication device using same
A communication device (100) employs a local oscillator (104) having an improved charge pump circuit (122). The charge pump circuit (122) has current mirrors (204, 208) in which a first transistor...
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5719529 |
Operational amplifier and digital signal transfer circuit
An operational amplifier and a digital signal transfer circuit in which an output voltage does not decrease instantly even if an abrupt change of input signal due to noise causes a high-to-low...
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5717360 |
High speed variable gain amplifier
A MOSFET amplifier includes an amplifier stage with a boosted transconductance and a differential current mirror. The amplifier stage with a boosted transconductance includes complementary MOSFETs...
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5714906 |
Constant transductance input stage and integrated circuit implementations thereof
A low voltage constant transconductance input stage is achieved with relatively simple design methodology. The approach uses current-mode techniques and is based upon the processing of signal...
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5712594 |
Operational transconductance amplifier operable at low supply voltage
An OTA capable of low-voltage operation at a voltage as low as approximately 1 V while restraining the circuit scale increase and keeping approximately the same input voltage range as that of the...
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