How to plot HD3(dB) vs Pin(dbm) in Cadence spectre RF

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lachuns123

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To characterise linearity how to obtain third order harmonic distortion vs Input power(dBm)
 

I did PSS simulation,I can obtain total harmonic distrortion THD VS input power.But how to obtain HD3,third order harmonic distortion.It is different from IIP3 rite
 

lachuns123 said:
I did PSS simulation,I can obtain total harmonic distrortion THD VS input power.
But how to obtain HD3,third order harmonic distortion.
It is different from IIP3 rite
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Do one tone PSS analysis.

Evaluate P3rd_out or Pfund_out-P3rd_out, although I don't know what you mean by "HD3".
 
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I did PSS analysis and obtained power spectrum.3 RD order harmonic is obtained ,HD3=1/4(A3/A1) A3 AMPLITUDE OF 3rd order harmonic.A1,amplitude of fundamental.. How the harmonic amplitude can be plotted against input signal power,since in power spectrum its plotted against frequency.
 

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