how to design DICKSON charge pump.

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wonbef

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hi, all,

now i design a DICKSON charge pump with 0.6-um low voltage DPDM CMOS process, input dc voltage is +3V, and i hope the output is -3V. but the output voltage is only about -1.2V. why? Need your helps!


best regards,
 

If you used diodes, you lose 0.7V per stage and that leaves
nothing much after 4, and poor conversion ratio even
earlier. A synchronous-switched charge pump will do better.
Parallel-fed is way better than series fed too.

Be sure there isn't something dumb like a well diode clamping
the output voltage. If you burn a lot of current at open output,
might check that more carefully.
 

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