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闭环带宽,信号带宽分别是什么意思?

做跨阻放大器时,有好多个频率:

z1= 1 / (2 pi Rf (Cs + Cf))

p1= 1 / (2 pi Rf Cf)  信号带宽

fc= GBP / (1 + Cf / Cs) 闭环带宽

应该怎么理解?

信号带宽是指:我需要放大的微弱信号的带宽范围?

闭环带宽呢?

因为我之前一直认为电路的带宽就是增益带宽积GBP / 放大倍数