[SI-LIST] Differential TDR

Hi all,
When using differential probe to do the TDR for differential pair, if the
probe only has P and N tip no Gnd tip, does the TDR gives accurate values?

Here is the concern:

Zdiff =2*(Z_single-Z_mutual), if no Gnd tip is used, how does the TDR know
what's the single-ended impedance, and consequently how does TDR know the
Zdiff?


Thanks,

ZG


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