[SI-LIST] Re: Conversion from dB to ohm

Bob,

Isn't S21 in dBm??  In that case the reference value is 1 mW and you =
have an additional=20
E-3 factor to take care of.

Larry


-----Original Message-----
From: Bob Patel [mailto:whizplayer@xxxxxxxxx]
Sent: Friday, July 25, 2003 1:40 PM
To: si_list
Subject: [SI-LIST] Conversion from dB to ohm


Hi! The formula for conversion from ohm to dB is :
Ztrans=3D25*10^(|S21|/20).
So if S21=3D-60dB then Ztrans=3D25000, what is this value
in i.e. units is in ohm but do I need to divide it
with some factor to get in ohms.
I am trying to convert and it is not corelating.
Any inputs appreciated.
Thanks
Bob

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