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PNAX Comb Filter vs VMC calibration for group delay/phase shift measurement

Question asked by rok on Mar 28, 2014
Latest reply on Mar 31, 2014 by rok

I was asked by my design engineers what were the accuracy/uncertainty levels of the SMC+Phase calibration using a comb filter generator versus a traditional VMC calibration with reference/calibration mixer+IF filter as it pertains to group delay and phase shift(over a power sweep) measurements. The frequency ranges we test are Ku band and Ka band downconverters. I'm thinking the comb filter generator technique should be more accurate. Is that correct? Is there an application note that addresses this?