[SI-LIST] Re: Ringing in Return Loss data
- From: steve weir <weirsi@xxxxxxxxxx>
- To: qazi <qazi@xxxxxxxxxx>
- Date: Mon, 25 Aug 2008 18:35:52 -0700
Ripple means mismatch somewhere in the path. The frequency(s) at which
the ripple occurs and the severity will provide clues as to what is
mismatched.
Steve.
qazi wrote:
> 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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