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charge pump stability issue

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cathyyang

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who has papers about analyze of charge pump loop. I use the following circuit , I want to solve the issue:
1. How can i do ac simulation of loop,
2. how can i make up the small signal model of loop

 

776ft

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looks like this is long time ago.

I don't think you have a loop in this circuit, unless you have a feedback voltage to control you are pumping or not, then you have a loop, for that loop stb, stable means less ripple on the output, unstable means more ripple on the output, you can calculate the delay from the output to the pumping arbiter, there won't be oscillating, the worst case is how many extra pumps you pump to the output cap to create ripple.

that's my understanding. might be wrong.
 

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