Topic
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•
22 Dec 2003
TL;DR: In this paper, a method and system for providing a mixed-mode (current and voltage-source) audio amplifier is presented, where the first and second networks vary an output impedance or transconductance of the amplifier as a function of frequency of the input voltage signal.
Abstract: A method and system for providing a mixed-mode (current- and voltage-source) audio amplifier is disclosed. The mixed-mode amplifier includes a voltage sensing feedback path including a first network comprising at least one circuit; and a current sensing feedback path including a second network comprising at least one circuit. According to the method and system disclosed herein, the first and second networks vary an output impedance or transconductance of the amplifier as a function of frequency of the input voltage signal, such that at a first frequency range, the amplifier operates substantially as a current amplifier, and at a second frequency range, the amplifier operates substantially as a voltage amplifier, thereby inheriting distortion reduction of the current amplifier and stability of the voltage amplifier.
30 citations
Patent•
14 Apr 1999
TL;DR: In this paper, an incidental offset voltage caused by discrepancies in material and workmanship can be averaged by using two input transistors of a differential amplifier alternately, and switching output signals from both the input Transistors through two switches provided to an output end.
Abstract: An incidental offset voltage caused by discrepancies in material and workmanship can be averaged by (1) using two input transistors of a differential amplifier alternately, and (2) switching output signals from both the input transistors through two switches provided to an output end. Consequently, a downsized, less-power-consuming, highly-reliable differential amplifier which is insensitive to an incidental offset voltage caused by discrepancies in material and workmanship can be provided. Also, by employing such a differential amplifier, a less-power-consuming and highly reliable operational amplifier and a liquid crystal driving circuit capable of showing display of an upgraded quality can be realized.
30 citations
Patent•
21 Apr 1972
TL;DR: In this paper, a photo sensitive detector coupled to a pair of cascoded field-effect transistors was used to operate at substantial unity gain, and the bandwidth of the amplifier was extended relative to the neutralization of the input capacitances.
Abstract: An amplifier of electromagnetic wave energy in the visible and infrared range includes a photo sensitive detector coupled to a pair of cascoded field-effect transistors arranged to operate at substantial unity gain. A positive feedback path includes the input capacitances of the amplifier reducing and thereby neutralizing the input capacitances of the amplifier. The bandwidth of the amplifier is extended relative to the neutralization of the input capacitances.
30 citations
Patent•
07 Mar 1991
TL;DR: In this article, a push-pull configuration of the distributed amplifier is used in combination with the 180° phase shifting power splitter to cancel the 2IM distortion created within the distributed amplifiers, and to double the output capability of a single distributed amplifier.
Abstract: An apparatus for and a method of RF amplification of signals up to 1 GHz. The apparatus, known as a repeater station, is for use in Community Antenna TeleVision transmission (CATV). The RF amplification (gain) stage includes two multitransistor distributed amplifier stages connected in a push-pull configuration. Each distributed amplifier includes four transistors connected to produce two-each cascode circuits. The distributed amplifier stages are operated in push-pull configuration by means of a 180° phase shifting power splitter. The push-pull configuration of the distributed amplifier operates in combination with the 180° phase shifting power splitter to cancel the 2IM distortion created within the distributed amplifiers, and to double the output capability of a single distributed amplifier. By installing very linear cascode connected transistors in the distributed amplifier, CATV operators can effectively double the basic circuit output capability and at the same time maximize RF bandwidth achievable with a given transistor.
30 citations
Patent•
22 Oct 1999TL;DR: In this article, the output of the main power amplifier is modified by measuring peak-to-peak signal values of the distortion in the output, which is measured in a signal derived by comparing an output derived from the main amplifier with an output obtained from the input signal.
Abstract: The invention relates to an amplifier arrangement for amplifying an input using a distorting main power amplifier such as one operating as a class AB amplifier. The method and apparatus add to the input signal to the main amplifier a predistortion signal intended to compensate for the distortion added by the main power amplifier. In accordance with the invention, the input to the predistortion circuit is modified by measuring peak-to-peak signal values of the distortion in the output of the main power amplifier. The peak-to-peak values are measured in a signal derived by comparing an output derived from the main amplifier with an output derived from the input signal. A digitally controlled processor iteratively modifies various phase and gain controls to adjust the output of the amplifier.
30 citations