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question about the SC circuits

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parkjinheel

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I need to implement a Nth parallel bandpass circuit with complex FIR and IIR;

So, first, I want just to try a simple sample SC sample cirucuits in the test.jpg with input frequency 100 and sample frequency 1k,however, after i use the DFT in the cadence and found that the output frequency is not the fout = fin +k*fsample, which should be 900,1100 or 1900,2100 and so on. The fout actually is 875,1125 or 1875 or 2125 and so on as shown in the spectrum.jpg


What is the problem so far?

Thank you
non_inverting_sample.jpg
test_1.jpg
transient.jpg
spectrum.jpg
 

parkjinheel

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when i increase the fin to 500 the fout seems to be right with the 500,1500 or 1500, 2000 and so on
fin_500.jpg
 

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