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Calculating the Inductance and Q of Spiral Inductors - RF Cafe Forums

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 Post subject: Calculating the Inductance and Q of Spiral Inductors
Posted: Thu Sep 16, 2010 2:46 pm 
 
Colonel
 

Joined: Mon Apr 10, 2006 12:43 pm
Posts: 25
Good day.

I am working on calculating the inductance and Q of some spiral inductors. These inductors are modeled using Momentum from Agilent.

A Momentum example gives the following procedure -

(1) Convert the S-Parameters to Z-Parameters using
ZM_2p=stoz(s)

(2) Convert the 2 port Z-parameters to a 1 port Z-parameters. Agilent states that Port 2 is considered to be grounded.
Z_2pTo1p=ZM_2p(1,1)-2*ZM_2p(1,2)+ZM_2p(2,2)

Then use the real and imaginary parts to determine the inductance and resistance.

The question I have is in step 2.
I come up with the equation
Z_2pTo1p=ZM_2p(1,1)-(2*ZM_2p(1,2))/(ZM_2p(2,2))

Where did I go wrong?
Thank you
Michael




Posted  11/12/2012
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