Cascade CMOS voltage doubler output does not increase

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millinium

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Anyone knows why the output of the voltage doubler doesn't increase even though i cascade it up to 3rd stage?..Tnx for any answer. i attach the circuit of the 1st stage voltage doubler with its simulated output.
 

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Your graph shows Vin = 200mV, Vout = about 395mV. What's the problem?
 

there is no problem when using a single stage..but when i tried cascading it the output remains the same..anybody knows how to solve this problem?
 
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i cascaded it in such a way that the output of the first stage is the input of the 2nd stage and soon..the clock is equal to all stages..btw, the values of the component in the 2nd stage is the same in the 1st stage..tnx for the reply
 

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