[SI-LIST] Re: balun theory
- From: "Jon Powell" <jonpowell@xxxxxxxxxxxx>
- To: <atifshamimkhan@xxxxxxxxx>, "Si" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 9 Jul 2004 14:28:42 -0700
Hey,
A chance to use SI-DRAW to send a figure.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of atifshamim khan
Sent: Friday, July 09, 2004 10:27 AM
To: Si
Subject: [SI-LIST] balun theory
Hi all
Following figure is a basic balun structure. I have utilized this to
feed/test an on-chip dipole on bulk Si, but I still dont know how it works
in theory.
There is an unbalanced signal (Zin) at the input and a balanced signal at
the output(load resistor ZL). Basically one end of the transmission line is
grounded. At the output (the two ZL terminals) have signal which is equal
in magnitude but opposite in phase.This means that between the two
transmission lines a phase reversal has taken place. How is this achieved or
in other words how can we explain the working of this balun in terms of
voltages and currents or electric and magnetic fields? My guess is that we
are forcing and odd mode in the transmission lines? Is that right? what is
the difference between odd mode and even mode impedances here. Any input in
terms of explanation or references will be appreciated.
Thanks
Atif
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