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FET amplifier

About: FET amplifier is a research topic. Over the lifetime, 7048 publications have been published within this topic receiving 77549 citations.


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Patent
01 Jun 1973
TL;DR: In this article, a complementary FET amplifier is biased to a given operating point by applying a reference potential to its input terminal and varying the operating potentials supplied to the amplifier in accordance with its output signal.
Abstract: A complementary field-effect transistor (FET) amplifier is biased to a given operating point by applying a reference potential to its input terminal and varying the operating potentials supplied to the amplifier in accordance with its output signal. At least one other complementary FET amplifier, integrated upon a common substrate with the first amplifier, receives operating potentials which also vary in accordance with the output signal of the first amplifier for maintaining the quiescent operating point of the other amplifier at a value substantially equal to the given operating point of the first amplifier.

37 citations

Patent
15 Mar 1990
TL;DR: In this paper, an optical receiver circuit for an incoming optical signal having a variable power level includes an optical detector for receiving the optical signal and generating a current therefrom which varies with the optical signals power level.
Abstract: An optical receiver circuit for an incoming optical signal having a variable power level includes an optical detector for receiving the optical signal and generating a current therefrom which varies with the optical signal power level. The current so generated is applied to a transimpedance amplifier. An automatic gain control (AGC) drive circuit is connected around the amplifier thereby increasing its dynamic range. The AGC drive circuit drives a FET which has one side thereof connected to the transimpedance amplifier for shunting current from the input thereof. A negative feedback circuit comprising an amplifier is connected across the FET, which comprises the resistive feedback element, thus reducing the FET resistance by a factor of 1+T, where T is the feedback circuit loop gain.

37 citations

Patent
29 Nov 1991
TL;DR: In this paper, a wideband distortion corrector is proposed for use in a spacecraft for correcting amplifier distortion, which includes a FET mounted in a miniature microwave-type housing, and an inductor is coupled between the FET source and drain electrodes within the miniature housing.
Abstract: For use in a spacecraft for correcting amplifier distortion, a wideband distortion corrector avoids the need for directional couplers. The corrector includes a FET mounted in a miniature microwave-type housing. Signal flows through the source-to-drain channel. A gate impedance selected to be inductive at the operating frequency is coupled from the FET gate to the platform of the package, and may be simply a loop of bond wire. The channel connects by a strip transmission line to an amplifier, the distortion of which is to be corrected. For enhanced bandwidth, an inductor is coupled between the FET source and drain electrodes within the miniature housing. The platform of the package is coupled to the reference conductor of the transmission line. In one embodiment, direct bias voltage is applied by way of a bias tee across a strip transmission line and ground, and galvanic connections cause the bias to appear between the FET gate electrode and the channel.

37 citations

Patent
13 Aug 1997
TL;DR: In this paper, an ultra-low noise, high gain interface circuit for single-photon readout of known photodetectors from the x-ray to long IR bands at video frame rates is presented.
Abstract: An ultra-low noise, high gain interface circuit for single-photon readout of known photodetectors from the x-ray to long IR bands at video frame rates. The detector current modulate's a load FET's gate-to-source voltage, which in turn modulates the gate-to-source voltage of a gain FET thereby producing a signal current that is an amplified facsimile of the detector current. The load FET's gate-to-source voltage is connected in the negative feedback loop of a low noise, high gain amplifier. This effectively reduces the resistance seen by the photodetector by the gain of the amplifier thereby reducing the interface circuit's RC time constant by the same amount. Because the amplifier pins the load FET's gate voltage for a given flux level, the load FET's 1/f noise is transferred to the amplifier thereby enabling single-photon readout sensitivity.

37 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231
20227
20211
20202
20193
20184