Hi Frank, Thank you very much for your help. I appreciate it. Please see below for what I noticed in the output log: Since I don't know why I cannot post screen shots, I will simply type the message here. PNoise with relharmnum=1: ********************************************************************************** Periodic Noise Analysis 'pnoise': freq = 1 MHz + (10 mHz -> 100 MHz) *********************************************************************************** Therefore, the frequency at 0 = 1 MHz. The peaking is displayed at 0 Hz, showing that flicker noise has been modulated to here. Is my understanding correct? Thank you Kenny
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