积分器输出波形问题

hanyongchunsd

请问有没有大佬遇到过这种情况啊，它的交叠区域会越来越大

wkp1992101

你是不是哪个结点上挂了大电容？感觉是每个周期给电容充一点电，你仿真时间加长，最后应该能看到稳定的一个瞬态结果。

hanyongchunsd

wkp1992101 发表于 2021-12-3 15:46
你是不是哪个结点上挂了大电容？感觉是每个周期给电容充一点电，你仿真时间加长，最后应该能看到稳定的一个 ...

这是我的仿真电路图，应该没有大电容呀，时间长了他好像交叠的更多了

任性

Curious, is this the output voltage waveform? Why are your output common-mode voltages inconsistent

hanyongchunsd

任性 发表于 2021-12-4 11:24
Curious, is this the output voltage waveform? Why are your output common-mode voltages inconsistent

yes,it is the output waveform. I still don't know the reason.

任性

hanyongchunsd 发表于 2021-12-5 19:49
yes,it is the output waveform. I still don't know the reason.

maybe it's incorrect for the CMFB

hanyongchunsd

任性 发表于 2021-12-6 21:35
maybe it's incorrect for the CMFB

I have check it, my CMFB Loopgain PM is 70， Gain is 70 dB and the GBW is about 1/3 of Different ,is that ok? and there is another phenomenon if I take a long time sim,the output wave will stable at  the common voltage,like this fingure

任性

hanyongchunsd 发表于 2021-12-7 09:29
I have check it, my CMFB Loopgain PM is 70， Gain is 70 dB and the GBW is about 1/3 of Different , ...

so, what is your CMFB GBW and signal loop GBW and input signal frequency? maybe  CMFB GBW need more bigger than signal loop GBW.