Low SNR at high frequencies

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Chinmaye

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Dear all,
I am trying to simulate .noise in cadence for a flip-around sample and hold circuit. The sampling frequency is 4MHz. I have connected the inputs to common mode. The freq range is from 1 to 2MHz. I see peaking in the noise response at 165KHz. I think I am missing out on something.
Is there anything that I am missing out on?
 

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Dear All,
In a switched capacitor amplifier, it is seen that the SNR degrades as the input frequency increases close to fs/2 where fs is the sampling frequency. Why?
 

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