Hi

I do not understand why QPSS does not work with IQ_demodulator (or MIXER_PB) in the rflib but works in PSS. I get the error message

Error found by spectre during Quasi-Periodic Steady State Analysis `qpss'.    
Fundamental name F1 given in parameter `funds' is either not associated with any fundamental name specified in input sources, or not unique

It appears to expect an actual external source like a port or vsin for the LO instead of an internal source as in the  mixer component
Furthermore if I replace MIXER_PB with mixer and osc (also from the rflib) it works fine but the osc does not need an actual source. The code for the osc is very similar to LO portion in  IQ_demodulator (or Mixer_PB). So why does it work in one but not the other?  I would rather use IQ_demodulator for image rejection modeling purposes. Suggestions?

Bill

No I did not have an independent signal source with the frequency set to the frequency of the internal source. I had no independent signal source at all except the rf input. It worked fine for a two tone PSS sim. I had to manually add the LO tone in the PSS setup window and it worked but wouldn't for QPSS. However, I have since added an independent source with the frequency set to the frequency of the internal source and it worked fine in both PSS and QPSS. Thanks good idea.