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SMC+Phase Group Delay Jumps

Question asked by delta on Mar 16, 2017
Latest reply on Mar 24, 2017 by delta

Dr_joel

Dr_Joel, 

I have a 2 stage downconverter which I am attempting to measure group delay on. I am using an N5245A PNA-X and have gone through the SMC+Phase calibration with the U9391F Comb Generator many times. What I cannot figure out is how to correct for the discontinuities that appear in the group delay measurement.

 

I got a copy of your book through our library and have read through section 7.5 (Mixer calibration). You identified the same problems I have in Figure 7.39 and 7.40, but did not mention how you arrived at the "corrected data" of figure 7.43.

 

Would you please share some insight into how I may correct for this?

 

I attached a plot of the forward conversion gain and group delay response. 

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