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一、引言模拟/数字转换器的精度要求日益提高,如果说十年前可以满足于10~(-3)的话,那末现在普遍都已经提出10~(-4)的要求,甚至更高。线路设计者成功地解决了很多问题:例如他们可以设计出饱和压降小于0.5毫伏的通道开关,可以使运算放大器的开环增益达到10~6,同时保证在闭环工作条件下有良好的频率特性等等。但是,就模拟/数字转换器的
I. INTRODUCTION The accuracy requirement of analog / digital converter is increasing day by day. If 10 ~ (-3) can be satisfied ten years ago, the requirements of 10 ~ (-4) have been generally raised even higher now. Circuit designers have successfully solved many problems: for example, they can design a channel switch with a saturation voltage drop of less than 0.5 millivolts, enabling an op amp's open-loop gain of 10 to 6 while ensuring good frequency in closed-loop operation Features and more. But on the analog / digital converter