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Pfd - charge pump simulation result

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subbareddy434

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Hi
i designed charge pump by using switch at drain topology...and i also connected loop filter to charge pump
charge pump specifications are i=75u
loop filter specifications r=5.4k
c1=4pf c4 =0.4pf
here i attached the schematic and waveforms.....
when both up and down becoming zero loop filter capacitor is discharging.
 

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