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Stability of switch capacitor bandgap ?

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cmos_ajay

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The bandgap in the attached photo has a feedback from the output. Obviously stability needs to be checked or it can show an output with oscillations.
How do I determine the gain margin and phase margin of the system ?
Can someone provide ideas for a test circuit to determine the stability parameters ?
 

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Switched Capacitor (SC) circuit AC behaviour is usually simulated with 'storistor'. I cannot help more with that, try google, I remember P.E.Allen have some tutorials for it.
 
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"State-space average models" are used on power conversion
simulations, for speed (accuracy, in the details, is on you).

I would be more inclined to a "stimulus-response" challenge
in transient analysis, looking for supply, ground and load
injection-points, perturbation and recovery from application-
realistic "stimuli".

Chopper mixing might produce some interesting frequency
domain artifacts and what this does to stability analysis
(especially "canned" stability analyses that just cough up
an intercept-point, may be fooled by spurii) that probably
wants inspection before belief.
 

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