cross couple charge pump, waveform inquiry? (circuit and waveforms are attached)
Hi,
I am using 6 modules from cross-coupled charge pumps, CCCP, ( circuit attached), to generate >1.8V out of 0.5V and I am using 1pF for all caps including output and minimum transistor sizes, nMOS (1.5um/0.6um) and pMOS (1.5um/0.6um)
These CCCP are simulated twice, first case with body terminals of nMOS connected to zero (there will be body effect). Second case with Vsb=0 (no body effect). The simulation waveforms are attached.
My questions about the body effect in these waveforms? I was expecting to see much difference for Vout voltage in steady-state because of higher Vth for nMOS devices in the circuit, but it was not the case! the difference is close to 0.1V
The only difference i can see is that with body effect, case 1, the settling time for Vout is much much higher than case 2.