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介绍了从实现双极性输入、提高分辨率、扩大输入信号动态范围等方面来提高80C196KC片内A/D性能的方法，并给出具体的方案。,The paper introduces several approaches to improve the performance of 80C196KC’s in-chip A/D,including how to realize the A/D’s input of AC signal ,how to improve the A/D’s distinguishability and how to widen the range of A/D’s input signal. Meanwhile,some practical circuits are given.