FreeLists / si-list / [SI-LIST] Re: delay vs. transmission line length

[Dorin <dorin.oprea@xxxxxxxxxxx>]

Hi Yoni,
When you add the T-line to the device you introduce reflection which will mask
the delay.

Thanks,
Dorin


Steve Horne wrote:

> I'm assuming when you say "driver output", you mean the input
> to the transmission line.  What is happening is that the
> transmission line's impedance is shielding the driver from the
> capacitive effect of the load.  A very short line will let the
> driver see almost all the load.  A longer line will reduce the
> effective load seen by the driver output, making the driver
> output respond faster.
>
> Steve
>
> Yoni Tzafrir writes:
>  > hi,
>  > i run some simulations, for measuring Tpd from input of the of the =
>  > driver to the output of the driver.=20
>  >
>  >              |\
>  >              | \driver               transmission line
>  >      input------------|  =
>  > \---------------------------------------------------LOAD
>  >              |  /out
>  >              |/
>  > I have noticed that the longer my transmission line, the Tpd becomes =
>  > shorter.
>  > does it make sense? as i understand it a longer transmission line means =
>  > more capacitance (and resistance) so the Tpd should be longer, doesn't =
>  > it?
>  >
>  > Yonatan (Yoni) Tzafrir
>  > *Tel:               (972) - 3 - 7552300 (T/L: 351)
>  > *Fax:          (972) - 3  - 6177130
>  >   *Mobile:       (972) -54- 459469
>  > *E-mail:       <mailto:yonitz@xxxxxxxxxxxxx>
>  >
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