RE: [SI-LIST] : RE: [SI-LIST]: Long bus or star?

Shayle Hirschman (shayle@mho.net)
Mon, 05 Apr 1999 14:28:49 -0500

Well said, Andrew, and I agree with you. Would the time "lag" due to the
reflection finishing after the incident finishes just be considered not
measureable if the load is close enough to the end of the trace?

Shayle

At 09:33 AM 4/5/99 -0700, you wrote:
>All -
>
>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:shayle@mho.net]
>Sent: Monday, April 05, 1999 9:00 AM
>To: si-list@silab.eng.sun.com
>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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