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引言为了获得较高的测量精度和易于读数,测量结果以数字显示的方法近年来极其流行。为了制造分贝输出的数字仪表,除了模拟——数字变换器外,还需使用对数放大器和其它计算器件。但是市售的利用半导体p—n结特性的对数放大器受温度影响大。况且,这种数字仪表的结构极为复杂。有一种简单的对数式电压——时间变换器,其输入信号加给一个电容器,此
Introduction In order to obtain high measurement accuracy and ease of reading, the method of displaying the measurement results in digital form has become extremely popular in recent years. In order to create digital output in decibels, logarithmic amplifiers and other computational components are required in addition to analog-to-digital converters. However, commercially available logarithmic amplifiers utilizing the p-n junction characteristics of the semiconductor are greatly affected by temperature. Moreover, the structure of this digital instrument is extremely complicated. There is a simple logarithmic voltage-to-time converter whose input signal is applied to a capacitor