[SI-LIST] Re: Zo vs Zin
- From: Om Mandhana <Om.Mandhana@xxxxxxxxxxxx>
- Date: Thu, 13 Mar 2003 09:52:54 -0600
Assuming the voltage and current amplitudes of the traveling wave as
(V0+, I0+) in the +z-direction and (V0-,I0-) in the -z-direction,
the characteristic impedance ZO is equal to the ratio of the voltage
amplitude to the current amplitude for each of the traveling waves
individually (with an additional minus sign in case of the -z propogating
wave).
Thus, the characteristic impedance
ZO = V0+/I0+ = -(V0-)/I0-.
The input impedance, Zin(z) is the ratio of the total voltage, (incident and
reflected),
V(z) to the total current, I(z) at point z on the line.
Thus, the input impedance
Zin(z) = V(z)/I(z).
The characteristic impedance is not equal to the input impdeance, unless one
of the
two waves is absent.
"Clewell, Craig" wrote:
> Jayaprakash,
>
> Zc is the ratio of voltage to current traveling in one direction on a
> T-line. Remember that a T-line has at least 2 modes of signal flow. When
> there are no reflections from the far end of the T-line Zin = Zc because
> there is only one mode of signal flow. When you have reflections on the
> line the relation Zin = Zc breaks down.
>
> Craig
>
> -----Original Message-----
> From: Jayaprakash Balachandran [mailto:edpc108@xxxxxxxxx]
> Sent: Wednesday, March 12, 2003 9:14 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Zo vs Zin
>
> Dear SIers,
>
> What is the difference between characteristic
> impedance and input impedance in a transmission line?
>
> Thanks in advance,
> Jayaprakash.
>
> __________________________________________________
> Do You Yahoo!?
> Everything you'll ever need on one web page
> from News and Sport to Email and Music Charts
> http://uk.my.yahoo.com
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
