BackerShu
Member level 3
sc cmfb
After adding the SC CMFB circuit to a fully differential opamp, I can only check whether the output common mode voltage could stay at the expected value with a certain time of tran. simulation to determine how the SC CMFB circuit works. Could someone tell me how to exactly find out its infulence on the opamp's AC performance GBW, PM, etc. by simulation? In another word, how to simulate the GBW and PM of a opamp with SC CMFB?
I have tried pss and pac simulation in SpectreRF. But the simulation result donesn't resonable. So I doubt this method may not work or I did it wrong way.
Methods using any tools would be helpful!
Thx in advance!!
After adding the SC CMFB circuit to a fully differential opamp, I can only check whether the output common mode voltage could stay at the expected value with a certain time of tran. simulation to determine how the SC CMFB circuit works. Could someone tell me how to exactly find out its infulence on the opamp's AC performance GBW, PM, etc. by simulation? In another word, how to simulate the GBW and PM of a opamp with SC CMFB?
I have tried pss and pac simulation in SpectreRF. But the simulation result donesn't resonable. So I doubt this method may not work or I did it wrong way.
Methods using any tools would be helpful!
Thx in advance!!