I am trying to setup PXF analysis to measure PSRR of a VCO. Cadence Appnote "Power Supply Rejection Ratio Characterization Using pectreRF Autonomous Circuits " states that modulated conversion should be used - what is modulation here & how does it work ? I am also not clear about Input & Output Modulated Harmonic List selections & why in case of modulated PXF analysis, maximum sideband is not that important - as the Appnote states. Please help... Thanks.