The rise TIME is the same. The rate of rise (edge rate or slew rate) will
double because the amplitude of the wave at the end of the transmission line
doubles.
Andrew Volk
Intel Corp.
-----Original Message-----
From: Shayle Hirschman [mailto:[email protected]]
Sent: Monday, April 05, 1999 9:00 AM
To: [email protected]
Subject: Re: [SI-LIST] : RE: [SI-LIST]: Long bus or star?
Mike,
It seems that the rise time would be that of the incident wave until the
reflection hits (almost immediately as mentioned), then be doubled as the
two waves converge and sum, then be that of the incident wave again as the
residue reflection completes.
Any thoughts?
Shayle Hirschman
At 11:16 AM 4/5/99 EDT, you wrote:
>Jon:
>
>As you noted, for the star configuration the effect is indeed incident wave
>switching; however, your deduction of the doubling of the rise time at the
>load is incorrect. As the (rising) wave arrives at the high impedance
load,
>the reflection is immediately launched in the reverse direction and adds to
>the voltage observed at the load. When the incident wave stops rising, so
>does the reflected wave. Since the sum of the two waves starts when the
load
>first encounters the incident wave and stops when it is complete, the rise
>time at the load is the same as that of the incident wave.
>
>Mike Conn
>Owner/Principal Consultant
>Mikon Consulting
>
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