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Which Ron for Switched-Capacitor Circuit?

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taik

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Hi all,

I think most of the guys here might have read before this paper: Simulating Switched-Capacitor Filters with SpectreRF.

On last line of Pg.11, there is a calculation using 4mkTRon where Ron is the on-resistance of the CMOS switch and is taken to be 2.3k ohms.

My question here is how did the 2.3k come abt?

I did plot the CMOS switch On-Resistance vs Vds curve.

The worst resistance is abt 4.9k ohm. 2.3k ohm is where Vds=0.

So which Ron value is it actually taken from?

Thank you in advance.
 

lladnar23

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Maybe he's using the VDS=0 condition since the noise is sampled after the switch settles, which implies that VDS has reached 0V. Just a guess, I haven't looked at that paper in a while...
 

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