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How to simulate the stability of SC CMFB loop in a full differential OPAMP?

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joskin

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How to simulate the stability of SC CMFB loop in a full differential OPAMP?
 

sc cmfb stability

joskin said:
How to simulate the stability of SC CMFB loop in a full differential OPAMP?
Click to expand...

you can replace the switched capacitor by resistor to run simulation.
the transient simulation is necessary.
 

Re: SC CMFB stability?

renwl said:
joskin said:
How to simulate the stability of SC CMFB loop in a full differential OPAMP?
Click to expand...

you can replace the switched capacitor by resistor to run simulation.
the transient simulation is necessary.
Click to expand...

Thanks!
One more question.
Because the OPAMP is applied in a SC integrator, how to model the external SC when running the simulation. Replace the SC by resistor?
 

Re: SC CMFB stability?

You can replace SC with short circuit. Under steady state, although SC is work, the feedback voltage is steady and unchanged. So, SC can be omited
 

SC CMFB stability?

run PSS simulation, you can include the switch.
 

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