关于放大器手册中的 增益带宽积 GBP ，单位增益交越 UGC， -3db带宽定义是怎样的，是在什么条件下测得的（openloop or closedloop），应该怎样使用这几个参数。最近在ADA4530手册上看到这几个参数，一直很困惑。 另外问一个相位裕度的问题，一般模拟系统中多大的相位裕度是合适的？相位裕度大小对系统都有那些影响？
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