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运放输入与输出的开环相移和闭环相移

Other Parts Discussed in Thread: TLV9052, OPA37, OPA2322

最近设计一个案子,需要严格控制运放输出信号与输入信号中间的相位差,越小越好。输入信号频率大约20K~30KHz 。

运放tlv9052的开环相移图如下:

从图中可以看出在20K频段中,输入输出是有120°左右的相移的。

如果在闭环增益为-2的情况下,相移会是多少呢?

一般情况下,加了负反馈之后的相移并没有图中那么大,这是为什么呢?