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本文提出了一种提高Ａ／Ｄ转换分辨率的新方法，即程控电压抵消法。它的基本原理是：在加法放大器的输入端引进若干个标定电压，此电压能抵消一部分输入电压，只要将标定电压按照一定的规律加以组合引入，就能在计算机程序控制下很方便地用较低分辨率的Ａ／Ｄ转换器获得较高的分辨率。接着，较详细地介绍了一个用８位Ａ／Ｄ转换器获得１０位分辨的应用实例，并给出了电路图和控制程序流程图。最后进行了误差分析。实践证明，在计算机的配合下，适当提高Ａ／Ｄ转换的分辨率，并保证其精度是可能的
In this paper, a new method to improve the resolution of A / D conversion is proposed, which is programmed voltage offsetting. Its basic principle is to introduce several calibration voltages at the input of the summing amplifier. This voltage can counteract a part of the input voltage. As long as the calibration voltage is combined according to a certain rule, it can be conveniently used under the control of a computer program Low-resolution A / D converter to obtain higher resolution. Then, a more detailed introduction of an 8-bit A / D converter to obtain 10-bit resolution application examples, and gives the circuit diagram and control program flow chart. Finally, the error analysis. Practice has proved that, in cooperation with the computer, the appropriate resolution to improve A / D conversion, and to ensure its accuracy is possible