[SI-LIST] Re: Converting S-parameter to Inductance and Capacitance
- From: "Hassan O. Ali" <hassan@xxxxxxxx>
- To: "H H Goh" <gohhh@xxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 9 Apr 2003 11:40:30 -0400 (EDT)
Oops! A small correction. The formula in step 1 should be:
S11_1p = S11_2p - S12_2p*S21_2p/(1+S22_2p)
Hassan.
On Apr 9 , "Hassan O. Ali" <hassan@xxxxxxxx> wrote:
>
> 1. Convert complex 2-port S-parameters into complex 1-port S-parameters with
> port 2
> shorted to ground:
>
> S11_1p = S11_2p - S12_2p*S21_2p/(1_S22_2p)
>
> 2. Obtain complex input impedance:
>
> Zin = Zo*(1+S11_1p)/(1-S11_1p)
>
> where Zo is the reference impedance.
>
> 3. Obtain effective inductance/capacitance:
>
> L(or C) = Im(Zin)/(2*pi*freq)
>
> where Im(Zin) is the imaginary part of the input impedance, pi = 3.14159...,
> freq is
the
> frequency.
>
> NOTE: By this method, you will not be able to determine separate capacitive
> and
> inductive contributions to the total reactance. You'll only be able to
> determine the
> effective inductance or capacitance of the network. In fact, I'm not aware of
> any "unique" way of separating those contributions. If you have an a priori
> knowledge
of
> the equivalent circuit of the network, you can use such tools as Agilent ADS
> to
> determine values of various components of the equivalent circuit that would
> yield same
S-
> parameter values. The resulting equivalent circuit computed in this way, of
> course, is
> not unique but serves many purposes.
>
> Regards.
>
> Hassan.
>
>
> On Apr 9 , "H H Goh" <gohhh@xxxxxxxxxxxxxx> wrote:
> >
> > Hi SI expert,
> >
> > Is there any software or formula to convert S-parameter to Inductance and
Capacitance.
> >
> > If there is, please advice where could I obtain it.
> >
> > Million thank,
> >
> > H H Goh
> >
>
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