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