[SI-LIST] Re: Dispersion in Lossy Lines
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Istvan Novak <istvan.novak@xxxxxxx>
- Date: Sun, 10 Apr 2005 14:21:20 -0700
Istvan, no this would be a multi-pole filter with distinct group delay
variations for specific frequencies. For a fixed and well known
waveguide, a specifically designed SAW filter might be useful. One might
intuitively look at this as sort of an up-chirp filter. The TDM image
would be a run-length limited NRZ source.
Regards,
Steve.
At 10:30 AM 4/10/2005 -0400, Istvan Novak wrote:
>Steve,
>
>Just to make sure we are on the same page, what do you mean
>by SP function and original image? Single pole? And the
>time-domain wave-shape of the source?
>
>Regards,
>Istvan
>
>
>steve weir wrote:
>
>>Istvan, to the extent that the dispersion looks like deterministic group
>>delay a SP function could theoretically reconstruct the original image.
>>
>>Regards,
>>
>>
>>Steve.
>>At 06:46 PM 4/9/2005 -0400, Istvan Novak wrote:
>>
>>>Adrianna,
>>>
>>>You can try to play with intentional mismatches
>>>at the source and load ends. You can compensate
>>>for part of the rise-time degradation this way,
>>>but be aware that the solution will be dependent
>>>on the interconnect parameters, most notably on
>>>the rise time of source signal, and the total
>>>loss of the trace. In other words, the more
>>>generic solution you want (the wider range of
>>>these parameters you want to cover), the less
>>>compensation you can achieve.
>>>
>>>
>>>Best regards,
>>>
>>>Istvan Novak,
>>>SUN Microsystems
>>>
>>>Adrianna wrote:
>>>
>>> >Hello,
>>> >
>>> >I have a hypothetical question on lossy lines.
>>> >
>>> >Suppose you send a square pulse down a lossy line. At the far end, the
>>> >square pulse maintains its overall shape but is attenuated and has a
>>> >degraded rise time. Besides matching impedance at the source or adding
>>> >parallel termination, which eliminate the reflections, what are some
>>> >ways, if any, to counteract the loss due to dispersion?
>>> >
>>> >
>>> >-Adrianna
>
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