一种大电流、极宽频带的跨导放大器

6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-09-21 DOI:10.1109/IMTC.1989.36858

O.B. Laug

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引用次数: 6

摘要

介绍了一种新型的大电流、超宽带跨导放大器的设计方法。该方法基于并联互补单极电流镜像单元的输入和输出。每个电池有一个固定的电流增益，由两个电阻的比值决定。差分输入电压-电流电路驱动单元阵列。该设计避免了对单个低阻电流感测电阻的需求以及此类电阻固有的随之而来的问题。为了对该方法有一定的实验了解，并对计算机仿真结果进行了验证，设计了具有10个正、负电流电池的跨导放大器原型。原型跨导放大器是直流耦合的，具有约750 kHz的3db带宽，并且可以在100 kHz时提供高达35 a的均方根(均方根)，输出电压为5 V RMS。讨论了输出负载调节和直流偏置等其他重要特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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A high-current, very-wide-band transconductance amplifier

A novel design approach for a high-current, very-wide-band transconductance amplifier is described. The approach is based on paralleling the input and output of complementary unipolar current-mirror cells. Each cell has a fixed current gain determined by the ratio of two resistors. A differential input voltage-to-current circuit drives the cell array. The design avoids the need for a single low-resistance current-sensing resistor and the attendant problems inherent in such resistors. A prototype of the cell-based transconductance amplifier was implemented with ten positive and ten negative current cells to gain some experimental familiarity with the approach and provide verification of computer simulation results. The prototype transconductance amplifier is DC coupled, has a 3-dB bandwidth of about 750 kHz, and can deliver up to 35 A RMS (root mean square) at 100 kHz with an output voltage of 5 V RMS. Other important characteristics such as output-load regulation and DC offsets are discussed.<>

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来源期刊

6th IEEE Conference Record., Instrumentation and Measurement Technology Conference

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