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sampled pnoise on multi-phase switched cap circuit

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Hi,
I have one question about the sampled pnoise simulation:
If I have a switched capacitor sample and hold circuit to sample the noise of resistor R, and now I add another switch sampler just paralleled with the first switch, with same sampling freq (fs) but nonoverlapping. so, the pss fund. freq = fs, but essentially the switch freq is 2fs.

how can  I simulate the circuit to get the right noise density (4kTR*pi/2*f3db/fs), instead of 4kTR*pi/2*f3db*2/fs? is pnoise option "sampleratio" is right way to do here.

thanks
Jeff


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