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How to simulate the DC gain and GBW of amp with sc cmfb

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winsonpku

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Dear all:
I designed an AMP with switch-capacitor CMFB. but i don't know how to simulate the open loop gain and GBW of this AMP. When i do this simulation,i replaced the sc CMFB with an ideal cmfb in the AMP,then i can get these results,but i don't know whether these results are the same as SC CMFB. Another quesition is how can i get the resolution of this SC CMFB,i mean how can i get the resolution by Hspice simulation?
Thanks all!


winson
 

jwfan

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Perhaps you can replace the sc with a resistor which has the equal resistance.
Compare the transient results of the circuit using sc and resistor. If they are similar, you can trust the AC simulation result using resistor.

But I am not sure if this method is correct. Just for your reference.
 

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