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using the PSS+pnoise to simulate the noise of the SC circuits

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Crystalll

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Hi there

I have several questions when I use the the PSS+pnoise to simulate the noise of the SC circuits as follows:

1.PNG 2.PNG

1) Ron is the Equivalent resistance of the switch，the noise of Fig.1 does not change with with Ron，but the noise of Fig.2 has relationship with Ron , The noise increases with the increase of resistance.why??
2) the noise has no relationship with clks, but simulate the noise of Fig.1, the noise is changed with the clk.why???


I appreciate your time and help.
 

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