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引言模/数(A/D)转换是计算机与外部联接的重要接口电路,为了能够用计算机处理模拟信号,必须首先经过A/D转换,计算机才能进行计算和处理。随着大规模集成电路的发展,近几年来A/D转换技术的进展颇为迅速,许多新的转换方法和转换电路不断地被研制出来并投入生产。但目前所有A/D转换器的输入电压一般都限制在±5伏或0～+10伏。然而,在许多过程控制和测试仪表中,被测量或被控制对象的有关参数经常是变化范围很宽的模拟量。因此,如何把这样的信号变换成能与A/D转换器相匹配的输入电压,从而实现模——数转换是
Introduction Analog-to-digital (A / D) conversion is an important interface circuit between computer and external connection. In order to be able to process analog signals with a computer, it must be A / D converted before the computer can calculate and process. With the development of large scale integrated circuits, A / D conversion technology has progressed rapidly in recent years. Many new conversion methods and conversion circuits are continuously developed and put into production. However, all A / D converter input voltage is currently limited to ± 5 volts or 0 ~ +10 volts. However, in many process control and test instruments, the parameters to be measured or controlled are often a wide range of analog variables. Therefore, how to transform such a signal into an A / D converter to match the input voltage in order to achieve analog-digital conversion is