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信息大都是连续变化的模拟量,它们无法直接由计算机进行处理,其间必须通过计算机的转接设备,这就是模数转换器.本文结合具体的模数转换器电路来说明其原理及部分实验方法. 常用的模数转换器(ADC)有锯齿波型、积分型、并行比较和并行级联型逐次比较型几种.锯齿波型积分型是较常用的方案,但速度较低.并行比较和并行级联型速度最高,但元件多,成本高,精度提高困难.逐次比较型,既可达到一定高的速度,所用器件也少,采用国产器件都能满足要求,所以这是使用较广的一种方案.
Most of the information is continuously changing analog, they can not be directly processed by the computer, during which must pass through the computer switching equipment, which is the analog-to-digital converter.This paper combined with a specific circuit to illustrate its principles and experimental methods Commonly used analog-to-digital converter (ADC) sawtooth wave type, integral type, parallel comparison and parallel cascade type successive comparison of several types. Sawtooth wave type is the more common program, but lower speed. Concurrent parallel cascade speed, but the components, high cost, accuracy is difficult to increase.Continuous comparison type, can reach a certain high speed, the device used less, the use of domestic devices can meet the requirements, so it is widely used A program.