[SI-LIST] Re: 50 ohms cable model

Did you test the actual cable on a TDT or VNA to verify this behavior? =
I've never seen a coax cable introduce overshoot in the real world.=20

Art Porter

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Truong, Gerald (Space Technology)
Sent: Wednesday, November 23, 2005 11:26 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] 50 ohms cable model

Hello SIGurus,
I modeled a 50 ohms cable using the data in cable's datasheet. The
equivalent distributed L and C yield 50 ohms but when I run the
simulation with a buffer that has a 50 ohms source impedance, the
results exhibit overshoot. When I run the simulation with the buffer
connected to a 50 ohms trace, the results yield a waveform with no
overshoot, as I would expect in a perfectly match transmission line
environment.=20

Does anyone have an explanation for why the 50 ohms cable induces
overshoot?

Thank you for your time.

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 =20

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