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effects of having a higher than Vdd clock to MOS (a switch) of a charge pump circuit

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allennlowaton

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good day EDA fellows..
I had this question in mind.
As stated in the title, what are the possible effects of having a higher than Vdd clock to MOS (a switch) of a charge pump circuit.
thanks.
 

But I also have PMOS. What are the possible effects on them?
 

Pls post your schematic for further analysis. Chargepump will boost some node voltage higher than Vdd, so it needs the voltage higher than Vdd to turn off PMOS completely?
 
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