[SI-LIST] Ringing in Return Loss data

  • From: "qazi" <qazi@xxxxxxxxxx>
  • To: <si-list@xxxxxxxxxxxxx>
  • Date: Mon, 25 Aug 2008 18:20:13 -0700

Gurus,
I can explain ringings on a TDR data but can anyone tell me why I am seeing
this on a Return Loss data for a layout that is geometrically correctly
done?
This is a simulation result based on a .brd file in allegro and I was
wondering if I was doing something wrong here as far as modeling the device
or the SMAs. This board uses Fr-4 and the traces are around 4.5 inches long
diff pairs. I know the impedances are kept constant (same geometry)
throughout the whole path and return path is ideal.
Rgds,
Qazi



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