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分布电容之所以为害,是因为惯常采用的放大器输入电阻太大。本文提出了一种减小分布电容影响的办法,这就是极大地降低放大器的输入电阻,使之接近于零(但不等于零),从而引进了准零阻放大器的概念。 准零阻放大器与常用的高阻电压放大器是对偶的,它们的特性、用途、线路结构、优缺点都有一一对应的关系。这种新电路可以完成各种信号放大功能,还兼有减小分布电容影响和改善频率特性的优点。将这种放大器用到长距离传输电测信号的场合,可以显著地减小引线分布参量造成的衰减和失真;将它用于宽放电路,可以减小放大器输入、输出电容的影响,从而大大增加带宽;将它用于输入电路,可以将视在输入电容由几十微微法减至1微微法左右。
The reason why distributed capacitors are harmful, because the amplifier input resistance is too often used. This article presents a way to reduce the effects of distributed capacitance by introducing a quasi-zero-resistance amplifier concept by greatly reducing the amplifier’s input resistance to zero (but not equal to zero). Quasi-zero-impedance amplifier and the commonly used high-impedance voltage amplifier is dual, and their characteristics, uses, line structure, advantages and disadvantages have a one-to-one relationship. This new circuit can be completed a variety of signal amplification, but also to reduce the impact of distributed capacitance and improve the frequency characteristics of the advantages. The use of such an amplifier for long-distance transmission of electrical measurement signals can significantly reduce the attenuation and distortion caused by the distribution parameters of the lead. Using it in a wide-emitting path reduces the effects of amplifier input and output capacitance, Increase the bandwidth; use it for input circuitry, which reduces the apparent input capacitance from a few tens to a pico-law.