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
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