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Sidelobes from Periodic AC (pac) Analysis

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ashrafsazid

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Hi,

Is it possible to get an ac transfer curve of a sampled system with all desired sidelobes? I did a pac analysis of SC filter with 20 sidebands and found the behavior like this. But I am interested on getting the side-lobes as like as seen in the textbooks.

pac.PNG

Please help.
 

First of all, what simulator do you use ?

I meant Sidebands.
Even if you mean sidebands, I can not understand what you want to plot at all.

Can you understand PAC(Periodic AC) Analysis ?

I assume you use PSS/PAC Analysis of Cadence Spectre.

Code:
f(out)= f(in) + Ki * fund(pss)
f(in) represent the (possibly swept) input frequency.
fund(pss) represents the fundamental frequency used in the corresponding PSS analysis.

Default of `freqaxis' is the absolute value of the output frequency(`absout').

What plot do you want to expect ?

Show me netlist fragments regarding PSS and PAC.
 

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