[SI-LIST] Re: impedance and Characteristic impedance
- From: "Peterson, James F \(EHCOE\)" <james.f.peterson@xxxxxxxxxxxxx>
- To: "si-list" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 21 Mar 2007 06:20:13 -0500
If I read Raj's question correctly, he is asking a question many of us
have asked :
How can the impedance for a transmission line be so independent of
frequency when normal circuit impedance is so extremely dependent on
frequency?
If you look into the telegrapher's equations you will see the derivation
of t-line impedances...this shows a logical, yet hard to understand,
trail to our familiar equation for the Z of a t-line.
Jim Peterson
Honeywell
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Tom Dagostino
Sent: Wednesday, March 21, 2007 12:34 AM
To: nagaup1@xxxxxxxxx; 'si-list'
Subject: [SI-LIST] Re: impedance and Characteristic impedance
Zo =3D3D SQRT(2PiFL/2PiFC). Yes there are terms for resistance and =3D
conductance
too but for this we can ignore them. The frequency dependence drops out
=3D
so
Z0 =3D3D SQRT(L/C). L and C can be functions of frequency but that is =
=3D
minor
compared to their magnitudes for most frequencies in most applications.
Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
tom@xxxxxxxxxxxxx=3D20
www.teraspeed.com=3D20
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
=3D
On
Behalf Of nagaraj
Sent: Tuesday, March 20, 2007 9:04 PM
To: si-list
Subject: [SI-LIST] impedance and Characteristic impedance
When I say impedance, it depends on the
capacitance and inductance. So, these two components depend on frequency
=3D
(wL
and 1/wC, where w=3D3D 2xpixF).
When I say characteristic impedance, it too
has capacitance and inductance involved. So when I say I maintain 50 ohm
characteristic impedance on my board... there may be lot of frequencies
involved in the design resulting in different characteristic impedance.
=3D
then
how the board is said as a 50 ohm impedance controlled..? =3D20
=3D20
=3D20
Thanks and regards,
Raj.
=3D20
________________________________________________________________________
_=3D
___
________
The fish are biting.=3D20
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