[SI-LIST] Re: Converting S-parameter to Inductance and Capacitance
- From: Ben Chia <bchia@xxxxxxxxxx>
- To: hassan@xxxxxxxx
- Date: Thu, 10 Apr 2003 14:47:30 -0700
Hi,
Try WBspice to convert 4-port S-parameter to Spice RLGC element model.
Their web site: www.optimalcorp.com
Ben
--------------------------------------------------------------------------------------------
Hassan O. Ali wrote:
>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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