[SI-LIST] Re: Ringing in Return Loss data

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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