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一、转换器的简要说明这是一种具有很多优点的电子积分式模/数转换器.这种模/数转换器的一个最大特点是当转换器线路存在很大的失调电压时,它能以很高的精度将电压(或电流)转换成数字量;另一个特点是积分器只在预定的基准电平(如线路地)一侧实现积分.对于不同极性的模拟输入信号,转换器的工作也一样.为了读出输入极性,无需专门线路。这种单侧积分工作是这样实现的:斜坡总是以同一方向、同一斜度接近并与基准电平相交;当检出积分器输出与零线或基准电平以同一方向和斜度相交时,启动转换工作。这种电路减小了时间响应的误差和转换器元件引起的误差,尤其是用比较器作为零交检出器时更是如此.
A Brief Description of the Converter This is an electronic integrated A / D converter with many advantages. One of the most important features of this A / D converter is that when there is a large offset voltage on the converter line, The voltage (or current) is converted into a digital quantity with high accuracy. Another feature is that the integrator integrates only on the side of a predetermined reference level, such as line ground. For analog input signals of different polarities, the converter The same is true for the job, in order to read the input polarity without special wiring. This unilateral integration is achieved by: The slopes are always in the same direction, with the same slope approaching and crossing the reference level; when the output of the integrator is detected and the neutral or reference levels intersect in the same direction and with the slope , Start the conversion work. This circuit reduces the error of the time response and the error caused by the converter components, especially when comparators are used as the zero-crossing detector.