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Design >> Mixed-Signal Design >> Step size of charge pump output!! Help
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Message started by kim57 on Oct 31^st, 2007, 7:42am

Title: Step size of charge pump output!! Help
Post by kim57 on Oct 31^st, 2007, 7:42am

I would like to ask anyone have the equation or know how to derive the equation for the step size of the charge pump output voltage??
Since the step of the output getting smaller when it reach the maximum value, so anyone know how to derive that?

Thank you
Regards

Title: Re: Step size of charge pump output!! Help
Post by Stefan on Oct 31^st, 2007, 9:46am

What about Ohm's law ? :)

A charge pump (see the name?) should deliver a specified current, not a voltage.

Title: Re: Step size of charge pump output!! Help
Post by Berti on Nov 1^st, 2007, 8:17am

Hi Kim,

many kind of circuits are entitled as "charge pumps". You should therefore be more precise.
But I think you talk about a "voltage-boost" circuit. When you write down the equation for charge conservation
for the different phases (like in a SC-circuits), you should get the answer you are looking for...

Regards

Title: Re: Step size of charge pump output!! Help
Post by kim57 on Nov 1^st, 2007, 9:04am

The charge pump that i refer to is same as the one i attached.