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Transient Simulation of a Capacitive Charge Pump Circuit

ZekeYeager

Dear forum members,

I am trying to simulate a simple circuit which is phase one of a two phased capacitive charge pump. It is a 3 capacitor, 2 in parallel and 1 in series with the others making a capacitive divider that can give a voltage ratio of 2/3rd of its supply voltage. I have inserted one nmos as a switch to keep things simple. The schematic is below:

I perform a transient simulation of this circuit but the voltage at Vcfly node never rises. The NMOS switch is kept very big to get a low Ron. The solutions I have tried for convergence is keeping cmin=1pF, skipdc=yes but so far no luck. The transient simulation is shown below/

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