Hi Everyone,
Thank you to everyone who takes the time to read this.
Question:
The differential IQ measurement class seems to need a Power Cal to apply a calibration, is this a true statement? Is there a way to apply a SOLT calibration to this class without a Power Cal?
Backstory:
My setup (which measures RFICs on a wafer) is using the N5245A with firmware A.10.65.08, the ports are connected to a probe card where I am starting to use an ISS for calibration. We were excited about this as it meant for calibrations down to the probe tips. And no more extra time connecting to a power meter/ ECAL. Usually, I went through calibration with a "standard" measurement class (which included a power cal) and applied that calibration to all other channels (some of which are differential IQ, I'm measuring THD in a similar way described here: http://na.support.keysight.com/pna/help/latest/Applications/Differential_Amplifier_Harmonic_Distortion_and_THD.htm ).
However with the ISS it's impossible to make this power cal, I went and made my own CalKit and used the standard measurement class as usual, but I can't apply the calibration to my channels with a differential IQ measurement class. I get an error that says;
the correction will turn off and trying to turn it on, will just yield error 612 again.
I've tried to run calibration with only the Differential IQ channel, and during the calibration, I have this option configured:
but this page still pops up:
Leading to this:
I'm not sure if this part of the problem.
When trying to calibrate a standard class I can see my Cal Method is 4 port (I've edited out the DUT connector and Cal Kit names):
But calibrating a differential IQ class, the method is unknown Thru:
Best,
Chris
for the DIQ channel, you need a calibration that has ResponseTracking terms for all the receivers that you are referencing in the traces you have defined plus the standard 1-port sparameter error terms for any port where you have match correction turned on. from the standard channel s-parameter calibration you will get the 1-port error terms, but that calibration will not produce the required ResponseTracking terms without including a power calibration step. So you will need to do a 2-tier calibration. you do the tier 1 calibration (guided + power) at the connector-ized plane and use your ECal and power sensor. For the 2nd tier, you can do your ISS calibration on wafer. once you have these two different calibrations, you can use the Cal Plane Manager feature to extract the s-parameters of the path between your connector-ized reference plane and the probe tip for each port and then de-embed each of those path from your tier-1 calibration that includes power and has all the response tracking terms. this way you end up with a calibration that has a reference plane at the probe tips, but still has the required power and response corrections.