[SI-LIST] Re: f-domain to t-domain simulation
- From: Istvan Novak <istvan.novak@xxxxxxx>
- To: Michael Rose <mrose@xxxxxxxxxxxx>
- Date: Mon, 05 Oct 2009 20:47:03 -0400
Michael,
In addition to the fact that losses will result in a rising impedance
profile, artifacts and conversion
errors can also create similar effects, so you need to sanity check the
numbers you get. The
TDR-like time-domain response requires an integral of the impulse
response, and any residual
plateau in the impulse response (if the translation from frequency to
time domain is done
incorrectly) will result in a similar monotonic rise of the calculated
impedance profile.
Regards,
Istvan Novak
SUN Microsystems
Michael Rose wrote:
> When I convert a f-domain channel to differential t-params (TDD11), I
> notice the impedance rising along a transmission line segment as if the
> tline is predominantly inductive. This tends to bias the impedance
> higher for features towards the far end. The single-ended f-domain
> channel includes the normal 50 ohm terminations. Is this a real
> phenomena? How is it explained?
>
> Thanks. Mike
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