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6753730 |
Differential amplifier and filter circuit using the same
A differential amplifier is constructed in such a manner that a unit includes the sources of a first and a second MOS transistor and the drain of a third MOS transistor are connected to each other,...
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6750704 |
Offset compensated differential amplifier
A differential amplifier comprises a differential input stage including first and second input devices and has first and second input electrodes and first and second output terminals. A...
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6750714 |
Opamp with infinite open loop gain
An operational amplifier circuit connected to a bi-directional cascode current amplifier is disclosed. The operational amplifier uses the bi-directional cascode current amplifier to filter out the...
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6747514 |
MOSFET amplifier with dynamically biased cascode output
A metal oxide semiconductor field effect transistor (MOSFET) amplifier with dynamically biased cascode output circuitry in which the biasing of the cascode output circuitry dynamically tracks one...
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6748204 |
Mixer noise reduction technique
In accordance with the present invention a mixer circuit noise reduction technique is provided. The mixer circuit of the present invention includes a gain stage for receiving a first signal and...
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6744319 |
Exponential function generator embodied by using a CMOS process and variable gain amplifier employing the same
An exponential function generator embodied by a CMOS process and a variable gain amplifier (VGA) employing the same. Since it is difficult for CMOS devices to attain an exponential function by...
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6744320 |
Variable transconductane variable gain amplifier utilizing a degenerated differential pair
Continuously tuning a transconductance. Coupling a degeneration resistance from a first source of a first transistor in a differential pair of transistors to a second source of a second transistor...
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6741130 |
High-speed output transconductance amplifier capable of operating at different voltage levels
A high-speed output transconductance amplifier (OTA) capable of operating at different voltage levels. The high-speed output transconductance amplifier configures a cross-coupled circuit with...
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6737919 |
Method and apparatus for calibrating a Gm cell utilizing a replica Gm cell
A method and apparatus for calibrating a Gm cell using a Gm replica cell. A digital to analog converter receives a Gm setting code and generates a reference current. The Gm replica cell adjusts the...
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6732337 |
Method and arrangement for testing the stability of a working point of a circuit
A DC transfer curve of a circuit is determined for determining the global dynamics of a circuit and a stability analysis is conducted for points of the DC transfer curve. The results of the...
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6731169 |
Differential amplifier circuit
The first amplifier circuit D 1 is formed by connecting drains of a pair of N-channel MOS transistors forming the first current mirror circuit CM 1 respectively to the drains of P-channel MOS...
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6727753 |
Operational transconductance amplifier for an output buffer
An operational transconductance amplifier includes a differential amplification unit adapted to generate first and second output signals through respective first and second output nodes by...
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6727757 |
Biasing circuit for transconductors
A transconductor circuit, including a differential transconductor amplifier circuit. The transconductor circuit includes an input pair of transistors adapted to receive a differential input...
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6724258 |
Highly-linear, wide-input-range, wide control-range, low-voltage differential voltage controlled transconductor
A voltage controlled transconductor (VCT) for receiving a differential input signal comprising a first voltage signal and a second voltage signal, and for providing a differential output signal...
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6724257 |
Error amplifier circuit
An error amplifier circuit includes a differential amplifier with a cascode gain stage and an amplifier. The differential amplifier receives a first input signal and a second input signal and...
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6720830 |
Low-power, differential optical receiver in silicon on insulator
A low-power differential optical receiver useful for high-speed optical communication between CMOS chips includes a multi-stage differential amplifier circuit including a first differential...
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6720832 |
System and method for converting from single-ended to differential signals
A single-ended signal is converted to differential signals with a first device that converts an input current of a single-ended input signal to a voltage, a second device coupled to the first...
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6717468 |
Dynamically biased full-swing operation amplifier for an active matrix liquid crystal display driver
A versatile amplifier circuit for driving a TFT LCD panel is disclosed. The amplifier circuit of the present comprises consists of a complementary input stage, biasing switches, and a rail-to-rail...
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6717467 |
Wideband differential amplifier comprising a high frequency gain-drop compensator device
A wideband differential amplifier includes a first differential stage connected to a Miller stage allowing an open-loop gain increase. The Miller stage includes a current source and a...
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6717474 |
High-speed differential to single-ended converter
A differential to single-ended converter, which is composed of a transconductance amplifier, a current mirror and buffer circuit and a transimpedance stage, is disclosed. A differential voltage...
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6714079 |
Differential amplifier with gain substantially independent of temperature
A differential amplifier is described comprising an input branch for receiving differential and common mode input signal components; an output branch providing differential and common mode output...
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RE38482 |
Delay stage circuitry for a ring oscillator
A ring oscillator includes an even-numbered plurality of ring coupled delay stages. Each delay stage includes a differential amplifier, a voltage clamping circuit, and a current source. The...
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6710667 |
Voltage controlled oscillator
Resistance elements of a differential circuit is formed of a plurality of transistors and transistors which are biased into a linear region deeper than those of other transistors and have a small...
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6710656 |
High gain amplifier circuits and their applications
A high gain amplifier circuit includes two differential transistor pairs and a current generator coupled to each differential pair to control tail current. Each differential transistor pair has a...
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6707336 |
Operational amplifier with chopped input transistor pair
The invention relates to an operational amplifier comprising a first transistor amplifier stage at an input of the operational amplifier, which first transistor amplifier stage comprises chopped...
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6703898 |
Differential amplifier comprising an unlocking device
A differential amplifier may include a first stage including a first transistor and a second transistor having the same polarity and assembled to constitute a differential amplifier. The first...
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6696869 |
Buffer circuit for a high-bandwidth analog to digital converter
The present invention relates to improved ADC buffers and AFEs for high frequency applications, such as VDSL. The present invention can also be programmably configured for other xDSL applications....
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6696894 |
Operational amplifier with independent input offset trim for high and low common mode input voltages
An operational amplifier provides independent trimming of V os for both high and low common mode input voltages. The amplifier includes complementary input pairs, and employs a steering circuit...
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6683497 |
MOS linear transconductance amplifier
To provide a linear transconductance amplifier which is easily implemented with LSI and has a linear transconductance superior in a frequency characteristic. In a MOS linear transconductance...
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6677822 |
Transconductor and filter circuit using the same
A filter circuit is provided for suppressing an increase of circuit area, enabling easy circuit design, realizing a reduction of power consumption by a common control voltage operation, and able to...
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6664853 |
Wide-bandwidth differential signal amplifier
An impedance element connecting the outputs of two transistors of a wide-bandwidth amplifier forms a zero. The output of transistor is connected to a current source. The wide-bandwidth amplifier...
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6664941 |
Amplifier circuit and liquid-crystal display unit using the same
An amplifier circuit including an input stage and an output stage which are cascade-connected between a signal input terminal to which an input signal is input and a signal output terminal to which...
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6661289 |
Voltage-to-current conversion circuit and OTA using the same
A voltage-to-current conversion circuit composed of MOSFETs of the same polarity and an OTA with Rail-to-Rail with a simple configuration that uses the same have been disclosed. The...
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6657486 |
MOS differential amplifier circuit having a wide linear input voltage range
A MOS differential amplifier circuit has a differential pair having first and second MOS transistors. The source electrodes of the first and second MOS transistors are commonly coupled and driven...
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6653900 |
Driving method and related apparatus for improving power efficiency of an operational transconductance amplifier
A driving method for improving power efficiency of an operational transconductance amplifier. The operational transconductance amplifier comprises a first current route and a second current route...
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6642788 |
Differential cascode amplifier
A differential amplifier amplifies input signals and includes first and second differential input transistor pairs. The first input pair controls output voltages by adjusting sink currents coupled...
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6642789 |
Operational amplifier input stage and method
A precision operational amplifier operating in single supply mode, including a single differential transistor input pair and a cascoded CMOS transistor pair, stabilizes the drain-to-source voltage...
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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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6642791 |
Self-biased amplifier circuit and method for self-basing amplifier circuit
An amplifier circuit includes a first input device coupled to a first input node and controlling a first current, a second input device coupled to a second input node and controlling a second...
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6639431 |
Differential input comparator
A comparator circuit is disclosed that senses a differential input polarity even when operating with a common mode voltage near the power rails (e.g., 50 millivolts) and under a wide range of...
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6628168 |
Multiple input, fully differential, wide common-mode, folded-cascode amplifier
A multiple input, fully differential amplifier. Embodiments make use of complementary differential transistors pairs connected with cascode transistors to form folded cascode pairs, to achieve wide...
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6624696 |
Apparatus and method for a compact class AB turn-around stage with low noise, low offset, and low power consumption
A turn-around stage is provided that accepts the full current swing from an input stage while maintaining a low quiescent current. The circuitry provides Class AB operation with quiescent currents...
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6624697 |
High frequency differential amplifier
The present invention relates to a folded differential amplifier having very high output impedance capable of being operated at frequencies of the order of gigahertz.
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6624698 |
Low-voltage, broadband operational amplifier
A low voltage, broadband differential operational amplifier which eliminates the long tail current source from the amplifier, thereby relieving the headroom requirements by a few tenths of a volt....
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6621342 |
Dynamic cascoding technique for operational amplifiers
An apparatus for a differential amplifier with dynamic cascodes. The apparatus of one embodiment comprises a dynamic cascode bias generator. A first and second cascode transistors are coupled to...
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6617921 |
High output swing comparator stage
A circuit and method is provided that provides an amplification stage to a comparator device that matches transistor transconductances to provide adequate amplification and employs diode coupled...
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6617922 |
Differential difference amplifier for amplifying small signals close to zero volts
A differential difference amplifier is provided for amplifying an input signal having a magnitude close to zero (or a negative supply voltage) and adding an offset voltage to the amplified input...
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6617925 |
Method and apparatus for gain compensation and control in low voltage differential signaling applications
A low voltage differential signaling receiver includes a gain compensation and control circuit having a low common mode compensation circuit and a high common mode compensation circuit. A control...
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6617923 |
Linear transconductance amplifier
A linear transconductance amplifier which is easily implemented with LSI and superior in a frequency characteristic. The linear transconductance amplifier includes N-channel MOS transistors M 1, M...
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6617926 |
Tail current node equalization for a variable offset amplifier
First and second differential transistor pairs, where each may be intentionally unbalanced or balanced, are provided. First and second variable current generators are coupled to control respective...
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