[SI-LIST] Re: How does the loading affects the rise time of a PAD?
- From: Michael Nudelman <mnudelman@xxxxxxxxxxx>
- To: "'cyc@xxxxxxxxxxxxx'" <cyc@xxxxxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Mon, 20 Aug 2001 13:58:20 -0400
The driver should be matched to impedance. The length of the line does not
matter. If your driver can drive 50 Ohm 3 inch line - it will drive 50 inch
line.
-----Original Message-----
From: C.Y. Cheng [mailto:cyc@xxxxxxxxxxxxx]
Sent: Monday, August 20, 2001 12:05 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] How does the loading affects the rise time of a PAD?
Hi folks,
I have got a basic problem to choose a PAD for GMII interface.
The system requires a PAD which could drive a 5 pF loading in
1ns rise time.
If I can choose a PAD which could drive a 3-inches long, 50 ohms
transmission line and meet spec. .
What if I use the same pad to drive a 15-inches long, 50 ohms
transmission line? The lump capacitance may increase to be 5 times of
previous case. Will it " slow down " the rise time of the PAD ?
Thanks,
C.Y. Cheng
ASIC designer
ADMtek Taiwan
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