A/D转换器在转换模拟信号为数字信号时 ,量化误差对大小模拟信号影响不同 ,对小信号转换精度造成的误差较大。为提高小信号的转换精度 ,本文提出量化相对误差问题 ,并给出一种误差平衡法 ,使A/D转换器转换小信号误差较大的问题得以改善。 A / D converter in the conversion of analog signals to digital signals, the quantization error on the size of the analog signal has a different impact on the small signal conversion accuracy caused by a larger error. In order to improve the conversion precision of small signal, this paper presents the problem of quantization relative error, and gives an error balance method, which can improve the problem that A / D converter converts large error of small signal.