FreeLists / si-list / [SI-LIST] Re: Characteristic Impedance

["Peterson, James F (EHCOE)" <james.f.peterson@xxxxxxxxxxxxx>]

<snip>=20
"Sqrt (L/C)...it's a DC model"=20
<snip>

At DC, inductance looks like a short and capacitance looks open... :)

Actually the lossless model for transmission lines works quite well in a
frequency region between DC and gigabit frequencies (roughly between
1MHz to a few hundred MHz).

The best advice for Sunil has already been given (check out a good SI
book)...and note : at some point in our career we all asked these basic
questions (at least to ourselves), or we never learned.

Take care,
Jim Peterson
Honeywell

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Joseph Kao
Sent: Tuesday, June 12, 2007 10:16 PM
To: sunil_bharadwaz@xxxxxxxxx; SI LIST
Subject: [SI-LIST] Re: Characteristic Impedance

Dear Sunil,

Sqrt(L/C) means non-lossy, ideal status for trace,  so also no frequency
dependent.
it's DC model.

Regards,
Joseph Kao

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of sunil bharadwaz
Sent: Wednesday, June 13, 2007 12:38 AM
To: SI LIST
Subject: [SI-LIST] Characteristic Impedance

Hello Friends ,
What exactly does a 50 ohm line mean on a PCB ?
Z0 being Sqrt (L/C).Is Z0 frequency dependent?
How does a DC Power supply trace see this?

Thanks!!

Regards
Sunil.B

      =3D20
---------------------------------
Boardwalk for $500? In 2007? Ha!=3D20
Play Monopoly Here and Now (it's updated for today's economy) at Yahoo!
Games.

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