摘要
以两点接地为例，分析并计算了采用差动放大器后系统的共模干扰，与有关文献所介绍的比较，本文得出的计算公式更具普遍性，这对于减少多点接地系统的共模干扰是很有用的．
Having used the differential amplifier, the common-mode interference of two point earth system is analysed and calculated. In the comparison with literature [I], the formulas drawn from this paper can be much more widely used. This is useful for suppression of the commonmode interference of multipoint earth system.
