Problems of charging and discharging dual capacitors in peak detectors

1496nuonuo

Problems of charging and discharging dual capacitors in peak detectors [Copy link]

HI

I would like to ask how the voltage of C1 is kept constant, and whether there is any good analysis method for the charging and discharging problems of a circuit with two capacitors like this?

cheers

maychang

"I want to ask how the voltage of C1 remains constant."

The original text does not say "the voltage of C1 remains unchanged". It only says "the discharge is very slow and the voltage on R does not drop much".

se7ens

This is a classic voltage doubler circuit. The voltage change of C1 depends on the capacitance ratio of C1 and C2.

Gen_X

Generally, C1=C2, which is exactly a voltage doubling relationship.

C2*R is required to be larger than the period of the input signal, otherwise the ripple will be too large.