提高运算放大器共模抑制能力的分析

The analysis of increasing OPA's CMRR

运算放大器广泛应用于各种采样环境当中,而在各种复杂的应用场合中当然都不会是理想放大器,往往工程师们比较容易忽视它的共模干扰问题,但共模干扰也是影响运算放大器使用的关键因素,只有尽可能地减小这些干扰,才能使运算放大器更好地发挥它应有的作用。所以本文将深入分析影响运算放大器共模抑制能力的三个因素,并给出针对这三个因素的应对措施及采样电路的PCB Layout的一些注意事项,继而增强运放的共模抑制能力,使运放更好地为工程师们所用。

The OPA has been used in many sampling environments, and they aren't ideal OPA,sometimes engineers ignore the common-mode disturb easily, but the common-mode disturb is always the most important factor in using, only decreasing the common-mode disturb,it can exert the OPA's effect well. So this article will analysis the three factors of affecting OPA's common-mode disturb deeply, and gives the measures and actions about the sampling's PCB Layout, then decreases the OPA's common-mode disturb, can make the OPA used well by engineers.