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Represent frequency-dependent inductor in Agilent ADS?

 
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wizardz



Joined: 05 Aug 2006
Posts: 45
Post28 Jul 2008 12:45   Represent frequency-dependent inductor in Agilent ADS?
I'm doing some circuit modeling of on-chip passives.

In this work, I have to add frequency-dependent inductors to ADS. The inductance vs. freq are now available in text forms.

I guess dataaccesscomponont(DAC) can do this works. But I find simulation error when using DAC in lumped inductor setup. (I can only find examples using DAC in dataitems).

Attached is a screen shot of my circuit model

Can anyone help me or suggest some help documents?

Thanks a great!

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wizardz



Joined: 05 Aug 2006
Posts: 45
Post08 Sep 2008 11:07   Re: Represent frequency-dependent inductor in Agilent ADS?
After some investigation I find a viable way.
Insterestingly, I post reply here to answere myself.

In ADS, we can use 1-port Z-parameter component(Z-box) in eqation based linear components. The Z parameters can be read from external file.

There is a parameter set in the Z-box called Ci. This can be used to model mutual coupling. As for how to represent mutual coupling in a complex invironment, I can only think out the way of series connecting sereval Z-box, each of which have different Ci to model the multiple coupling.

I still hope someone can offer better ways!
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BigBoss



Joined: 17 Nov 2001
Posts: 931
Helped: 47
Post22 Sep 2008 23:21   Represent frequency-dependent inductor in Agilent ADS?
"freq" is ADS variable and you can obtain a frequency depended inductor by using this variable such as.

L=k*freq*Linit

or similar thing..
Here k may be a coefficient or a function or something else.This equation increases (or deceases ) inductor value proportional to freqeuncy.
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