FET amplifier

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

High side, current sense amplifier using a symmetric amplifier

Abstract: A self-contained, bi-polar high-side current sense amplifier which detects the magnitude and polarity of current flowing from one device to another, is disclosed. The amplifier has a symmetric architecture having two inputs and two outputs. One output is active for positive input signals corresponding to current flow in one direction, and the other output is active for negative input signals corresponding to current flow in an opposite direction. A symmetric current mirror in the amplifier provides the OR'ing function required to provide only one output at a time. The amplifier also utilizes aluminum sense and gain resistors, which allow cancellation of resistor temperature coefficients.

High frequency power amplifier

Abstract: PURPOSE: To reduce current consumption of the high frequency power amplifier at the time of power reduction and to improve a linear modulation wave in distortion at the time of a maximum output, simultaneously and automatically. CONSTITUTION: A directional coupler 19 inserted to an input section of a post- stage amplifier 18 extracts part of input high frequency power of a pre-stage amplifier 17. The extracted power is superimposed onto a signal at a gate terminal of a post-stage FET 12 via a DC voltage generating circuit 28. Then a bias of the FET 12 is automatically controlled to an optimum value in response to an output level required for the power amplifier. COPYRIGHT: (C)1995,JPO

Combined filter and transconductance amplifier

Abstract: Embodiments of circuitry, which includes an operational transconductance amplifier and a passive circuit, are disclosed. The passive circuit is coupled to the operational transconductance amplifier. Further, the passive circuit receives an input signal and the operational transconductance amplifier provides an output current, such that the passive circuit and the OTA high-pass filter and integrate the input signal to provide the output signal.

Complimentary metal oxide semiconductor imaging device

Abstract: A CMOS imager includes a photosensitive device such as a photosensitive device such as a photodiode or photogate having a sense node coupled to an FET located adjacent to the photosensitive region. Another FET, forming a differential input pair of an operational amplifier is located outside of the array of pixels. The operational amplifier is configured for unity gain and a row or column of input FETs is connected in parallel. A correlated double sampler is connected to the output of the operational amplifier for providing a fixed pattern noise free signal.

Performance of a Diode-Clamped Linear Amplifier

Abstract: This paper proposes a new high-efficiency diode-clamped linear amplifier, and presents its theoretical and experimental performance. The main circuit of the proposed amplifier consists of series-connected MOSFETs, series-connected dc power supplies and clamping diodes. The circuit configuration is similar to a diode-clamped multi-level inverter, except for using complementary power semiconductor devices, n-channel and p-channel MOSFETs. A pair of complementary MOSFETs in each leg is operated in an active state, just like a conventional linear amplifier, whereas the other MOSFETs are operated in either on- or off-state like a diode-clamped multilevel inverter. As a results, a prototype 12-series diode-clamped amplifier shows an experimental efficiency as high as 90%, while a conventional linear amplifier has a theoretical efficiency of 78.5%. Experimental results demonstrate that the proposed amplifier has the capability of driving a three-phase induction motor rated at 2.2 kW.