FET amplifier

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

High bandwidth transversal filter

Abstract: A high bandwidth transversal filter is described having an input impedance matching network, a tapped delay line, a plurality of weighting amplifiers, a distributed summing circuit, and an output impedance matching network The delay line is implemented with a transmission line The input impedance of this transversal filter depends on the inductance and capacitance of the transmission line and the capacitance of the inputs of each of the FET's used as weighting amplifiers The gates of the FET's provide high impedance low loss taps of the delay line The weighting is accomplished by either varying the drain current of the FET's or by using capacitive voltage dividers to apportion the tapped signals The resulting weighted signals are applied to a distributed summing circuit which provides both high bandwidth summing and additional delays This summer is also implemented with a tapped transmission line The output impedance of this transversal filter depends on the inductance and capacitance of the summing line and the capacitance of the output of each FET The parameters of the transmission lines constituting the input delay line and the distributed summer can be selected to provide broadband impedance matching for the input and output of the filter The FET's thus act as high impedance taps, as weighting amplifiers, and as part of the input and output impedance matching networks

Servo amplifier for an electrically damped accelerometer

Abstract: A servo amplifier system for an accelerometer includes a torque coil. A torque coil is included in the output circuit of a first amplifier. A position sensor circuit develops a signal corresponding to the position of the coil which is applied to the input circuit of the first amplifier. An element, which may be a resistor, senses the current through to the coil and produces a voltage which is applied to a second amplifier having a low impedance output circuit. The output signal from the second amplifier is fed back to the input circuit of the first amplifier. Means are associated with the second amplifier to comply with the scaling and bandwidth requirements of the system.

Reconfigurable Dual-Band Bidirectional Reflection Amplifier With Applications in Van Atta Array

Abstract: We designed a reconfigurable dual-band reflection amplifier with operation frequency bands over 18 GHz and/or 24 GHz This one-port amplifier boosts the reflected signal over either of these two frequency bands or both as a dual-band reflection amplifier The amplifier circuit consists of an FET transistor and two p-i-n diodes, which act as switches to form a reconfigurable system The measured reflection gains at single 18 GHz and 24 GHz frequency bands are 176 dB and 1675 dB, respectively The dual-band operation frequency shows 112 dB and 15 dB gain at 18 GHz and 24 GHz, respectively Then, we realized a bidirectional amplifier using a dual-band −3 dB 90° branch line coupler integrated with two of the proposed reconfigurable reflection amplifiers This bidirectional amplifier is a two-port bilateral amplifier The measured reflection gains show at least 10 dB transmission gains ( ${S} _{21}$ and ${S} _{12}$ ) at operation frequency bands The proposed reconfigurable bidirectional amplifier is then used in a dual-band Van Atta array The proposed active retrodirective system outperformed passive Van Atta array by 5 dB gain with only half the number of antenna elements Each component is investigated analytically and analyzed by advanced design system Fabricated circuits are measured and show good agreement with simulations

Layout of a semiconductor memory device

Abstract: A power supply line is disposed parallel to a sense amplifier train including a plurality of sense amplifiers at the side of each subarray. The power supply line is connected to the sense amplifier included in the sense amplifier train via a plurality of drive transistors and a sense amplifier drive line.