这种运放单位增益响应曲线是否正常？能用不？

AcoAco

By the way as jxjxhwx  states, waveform is not strange. Indeed quite typical, for example, for low power (i.e. low branch currents) folded cascode opamp.

If you quickly want  to verify it please increase your branch currents as much as you can (take care of transistor regions)  and see the corresponding result

jxjxhwx国家的方式，波形是不奇怪的。确实是相当典型的，例如，低功耗（低支路电流）折叠式共源共栅运算放大器。

如果你很快要验证它，你可以增加您的支路电流（照顾晶体管地区），并看到相应的结果

perfect_ic

不见得不能用，首先要看一下是要用在哪些地方。用在不同的地方对运放具体参数要求不同。

feynmancgz

回复 11# AcoAco


   Ringing is typical, but I seldom see this kind of ringing waveform in good designs.
   If you say it's typical, could you give me some paper which show this kind of waveform ?

feynmancgz

回复 17# jxjxhwx


   of course， that's why I said it's bad. You must avoid this.
   Don't believe in AcoAco. It's definitely not typical.

fortissimo.g

回复 13# jxjxhwx

复习一下奈奎斯特判据。你这种bode plot，根轨迹上会有靠近虚轴的极点存在，所以就ring啦。
这种形状非常不安全，只要你的增益再大一点点，就会开始震荡