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:[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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>>
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