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运放的输入端

Other Parts Discussed in Thread: TL3016, VCA822

运放的输入端为什么一定要有直流通路?就是接一个电阻到地呢?之前用的VCA822有自激振荡,用户手册中说要在输入端接电阻到地,后来用的TL3016的比较器,输出波形明显的杂波,发现输入端接对地电阻后波形就变好了...我想请问这样的方式有什么理论依据呢?