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看教材，运放的增益带宽积是指运放的开环增益*带宽=常数，但在实际应用场景中，运放通常有负反馈，即运放处于闭环，那么问题来了：当运放工作于闭环时，闭环增益和带宽的乘积也是一个常数吗，其值等于开环增益*带宽吗？
您好，
开环和闭环都适用的，您可以参考下面文档，有推导过程：
https://zhuanlan.zhihu.com/p/370799949
