[SI-LIST] How does the loading affects the rise time of a PAD?
- From: "C.Y. Cheng" <cyc@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 20 Aug 2001 12:04:37 +0800
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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