积分型A—D转换器对同相噪声具有极大的抑制能力,特别适合于低电平转换。本文叙述能去除输入放大器和积分器的全部漂移的方法有二个。方法1如图1所示:假如在输入端加二个开关K_1、K_2。用eB表示输入放大器B的漂移,e_(vf)表示V—f转换器的漂移,将它分别等效在图1所示的位量。首先,开关K_1闭合、开关K_2断开,则V—f The integral A-D converter has a great ability to suppress in-phase noise, especially suitable for low-level conversion. This article describes two ways to remove the total drift of the input amplifier and integrator. Method 1 shown in Figure 1: If the input plus two switches K_1, K_2. Let eB denote the drift of input amplifier B, and e_ (vf) denote the drift of the V-f converter, which is equivalent to the amount of bits shown in Figure 1, respectively. First of all, the switch K_1 is closed and the switch K_2 is opened, then V-f