[SI-LIST] AW: 40 GHz probe calibration
- From: "Ippich, Alexander" <alexander.ippich@xxxxxxxxxxxxx>
- To: "arnshah@xxxxxxxxx" <arnshah@xxxxxxxxx>
- Date: Mon, 27 Oct 2014 06:39:10 +0000
Arnav,
I can confirm, that when attempting to calibrate GSSG style microprobes with
1000um S/G pitch, I also do see return loss much worse than 20dB at 40GHz. The
probes were calibrated with the recommended calibration substrate from the same
supplier.
The measurement protocol that was shipped with the probes states a S11 of
around -5dB at 40dB into a 50ohm load.
I would recommend using GSG style probes and smaller pitches to alleviate the
issue.
Best regards,
alex
-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Arnav Shah -X (arnshah - BBI TECHNOLOGIES INC at Cisco)
Gesendet: Sunday, October 26, 2014 8:16 PM
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] 40 GHz probe calibration
Hello all,
I am attempting a 40GHz calibration. I previously tried calibrating with 1000um
pitch G S S G differential probes without success. I think at 40GHz there is no
resonance, or planar waves on the cal substrate. Crosstalk is the main problem;
I will try calibrating with <500um probes. Is there a way to measure/calculate
this crosstalk? How can I verify this hypothesis? Right now, I define a good
cal as return loss below 20dB, is there any other information I can use in
determining a good cal?
Thank you!
-Arnav
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