Thank you ShawnLogan! Resistor is 920K rather than 920 posted before. I have revised the post. You are correct! If I move the capacitor prior to the switch, then get the 4KTR density. Now I know that 0.5/400k (the time of switch being closing) is too short to establish a signal of 27k. I have have read your PDF, it explains the aliasing well, thank you again! Im still trying to understand the principle behind this, quantitatively, maybe somtting about both "correlated" and "aliasing".
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