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