samiraaa wrote on Apr 11^th, 2009, 5:54pm:
You mean Cadence Spectre not Spectra ?
If so, PAC is not slave analysis for QPSS.
Master analysis of PAC is PSS. Slave analysis of QPSS is QPAC not PAC.

See http://www.designers-guide.org/Forum/YaBB.pl?num=1227668750

You can do simulation without using autonomous QPSS although it is a simple evaluation and lacking in accuracy.

Capture one-period waveform VCO alone or VCO with Mixer as Load using PSS.
Use "analogLib/vpwlf" or "analogLib/ppwlf" with frequency scaling in QPSS analysis for IP3 evaluation.
Here you can do IP3 evaluation using conventional two-tones-QPSS with QPAC.
RF1 and LO are treated as large signal in QPSS.
RF2 is treated as small signal in QPAC.

Also see http://www.designers-guide.org/Forum/YaBB.pl?num=1238150066

The followings are general notes.

  - Use correct terminologies.
      - Warnigns are different from Errors.
      - ADS is not name of simulator.
      - There is no tool which name is Cadence.
      - All gains in Direct Plot of Cadence ADE are "right", "true" and "practical" voltage gain.
      - MATLAB are different from Simulink.

  - Learn measurements using actual instruments. Not "EDA Tool Play".