To view the absolute crossing point voltage, for example (at least for
PCIe4). See my latest email that slightly changes the scope of this
question.
On 2017-02-22 12:28, Vinu Arumugham wrote:
Why single-ended measurements?------------------------------------------------------------------
On 02/22/2017 12:01 PM, Gary Giust wrote:
I'm creating a board that inputs a differential signal using SMA
connectors on one side, and passes the signal through 12" of PCB trace
before terminating each trace with a 2 pF capacitor to ground. I'll
(active) probe each of the differential conductors single-endedly
(using
2 channels of a real-time scope, one channel for each conductor).
DUT---SMA cables---12" trace---probe pads---2pF caps---ground
Should the traces be routed as (1) differential or (2) single-ended on
the PCB?
Since the measurement is single-ended, and the input to the board is
cabled, I'm thinking they should be routed single-ended on the board
as
well. If the traces are routed differentially, I believe they'll be an
impedance mismatch when the signal hits the differential PCB routing,
which can be avoided by routing single-ended.
Does that sound about right?
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