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Hi all,

I'd appreciate help in calculating the voltages in the circuit shown. I thought it should be fairly straight forward, but it has me stumped. This is a sample-and-hold circuit for an ADC -- the switch is closed to charge the hold capacitor with the sample voltage and then opened to isolate during conversion. I'm trying to model the charging profile of the hold capacitor when the switch is closed.

I've shown the initial conditions as well as the basic circuit equations, but I can't figure out how to actually solve it, mainly I think because the differentials are sort of co-dependent.

Thanks in advance,

Chris

I'd appreciate help in calculating the voltages in the circuit shown. I thought it should be fairly straight forward, but it has me stumped. This is a sample-and-hold circuit for an ADC -- the switch is closed to charge the hold capacitor with the sample voltage and then opened to isolate during conversion. I'm trying to model the charging profile of the hold capacitor when the switch is closed.

I've shown the initial conditions as well as the basic circuit equations, but I can't figure out how to actually solve it, mainly I think because the differentials are sort of co-dependent.

Thanks in advance,

Chris