一、前言集成运放的主要参数多达十几项以上,而且其数值又趋向两个极端。例如失调电流 I_(os)小到 PA 量级,失调电压 V_(os)小到μV量级;另一方面开环电压增益 A_(od)与共模抑制比 CMRR 可高达10~6～10~7。显而易见,要自 I. INTRODUCTION The main parameters of the integrated operational amplifier up to a dozen or more, and its value tends to the two extremes. For example, the offset current I os is as small as the PA level and the offset voltage V os is as small as μV. On the other hand, the open loop voltage gain A od and the common mode rejection ratio CMRR can be as high as 10 6 to 10 7 . Obviously, to self