Thank you Andrew. They are indeed the same question and it's a coincidence.. Now I konw aliasing happen in this case, but I can't understand clearly the principle behind this. it's wide-band noise when switch is open, but it's band limited noise when closing, and it seems that dutycycle has some effects. Could you explain this more: " the output noise is higher because of the sampling of the wide-band thermal noise into the band up to the Nyquist frequency " Thank you!
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