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Voltage divider with switched-capacitor resistor

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Wheatley

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Hi, I want to design a voltage divider with a (by the moment) ideal resistor and a switched-capacitor (SC) resistor.

The circuit looks like this:

--- Va
|
|
\
/ Rideal
\
/
|
|
x Vx
|
|
\
/ SC
\
/
|
|
--- Vb

I have V1 = 640 mV, V2 = 560 mV, R1ideal = 53 MOhm and SC is build with the simple building block (two ideal switches with a non-overlapping 15.625 kHz clock and a 0.5pF ideal capacitor).

The thing is that the SC should behave like a 64 MOhm resistor and it does not do it. The Vx voltage I get is ~10 mV higher than expected.

What am I missing in the analysis?

Thanks!
 

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