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?
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List forum is accessible at:
http://tech.groups.yahoo.com/group/si-list
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
