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一、概述由于对数视频放大器能在视频范围内,把大范围的输入动态信号压缩成小的输出动态,因此,近十几年来,高质量的对数视频放大器已广泛地应用于通信、雷达接收机、医用电子设备等许多领域。对数视频放大器一般有真对数视频放大器(其输出是输入的真正对数函数)和似对数视频放大器(其输出是输入的近似对数函数)之分。真对数视频放大器电路,通常都是由二极管或晶体三极管作为对数元件,再加上适当的视频放大电路(可由宽带运算放大
I. Overview Since logarithmic video amplifiers can compress a wide range of input dynamic signals into small output dynamics within the video range, high-quality logarithmic video amplifiers have been widely used in communications, radar Receiver, medical electronics and many other fields. Logarithmic video amplifiers generally have a true logarithmic video amplifier (the output of which is the true logarithmic function of the input) and a logarithmic video amplifier whose output is an input logarithm of the logarithmic function. True logarithmic video amplifier circuits, usually by the diode or transistor as a logarithmic component, coupled with the appropriate video amplifier circuit (which can be amplified by the broadband operation