FreeLists / si-list / [SI-LIST] Re: how to model frequency dependent resistor using hspice?

["Wang Dustin" <wyqdustin@xxxxxxxxxxx>]

  I think i found a solution.Given the series resistor R=Rdc+Rac and Rac is 
related to frequency.I use a G element parallel with a resistor(R=Rdc) to 
represent Rdc+Rac. The laplace transfer function of G element is 
Rac/(Rdc*(Rdc+Rac)). 

  I used hspice to do simulation. It seemed right.

Thank you!




>From: Raj Raghuram <raj.raghuram@xxxxxxxxxxxxxxx>
>Reply-To: raj.raghuram@xxxxxxxxxxxxxxx
>To: wyqdustin@xxxxxxxxxxx
>CC: si-list@xxxxxxxxxxxxx
>Subject: Re: [SI-LIST] how to model frequency dependent resistor 
usinghspice?
>Date: Wed, 04 Jan 2006 13:22:11 -0800
>
>Ideally, the dual of the G or VCCS laplace element is the H or CCVS
>laplace. Unfortunately, HSPICE does not have a laplace for H elements.
>Some options you have are,
>
>1. Find Gskin (= 1/Rskin) as a function of frequency and find the
>laplace transfer function in the same way as you did for G.
>
>2. Instead of using Laplace controlled sources, there are RLC models
>which model skin effect well. A simple model is an L in parallel with a
>series RL. The HSPICE optimisation feature can be used to get at these
>values.
>
>3. It is always possible to represent a laplace rational function in
>terms of RLC elements and simple linear controlled sources. You can
>model the skin resistance imagining you have a laplace CCVS and then
>convert it to RLC elements and simple controlled sources.
>
>4. You are trying to say some Vx/Ix = Rskin. You can use a simple CCVS
>to convert Ix to a V'x. Then you can use the E element laplace to relate
>Vx and V'x.
>
>
>Warm Regards,
>
>
>
>On Tue, 2006-01-03 at 20:04, Wang Dustin wrote:
> > hi,all:
> >
> >   Now, i am trying to model transmission lines with discontinuity using
> > transmission line equation. The frequency dependent loss leads to 
frequency
> > dependent R and G. I want to use laplace transfer function to replace 
the
> > frequency dependent R and G in hspice respectively.
> >
> >   I have used G element with laplace function to replace shunt 
resistor.
> > But i don't know how to use E element or G element to replace series
> > resistor.
> >
> >    Is there any ideas to do transient simulation with the frequency
> > dependent series resistor?
> >
> >   -Thanks,
> >
> > Yuanqing Wang
> > State key lab of millimeter waves
> > Southeast University
> > Nanjing
> > China
> >
> > _________________________________________________________________
> > 涓???虹????杩??浜ゆ?锛??浣跨? MSN Messenger:  
http://messenger.msn.com/cn
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>--
>Raj Raghuram
>Berkeley Design Automation (http://www.berkeley-da.com)
>2902 Stender Way
>Santa Clara, CA-95054-3213
>Tel: 408.496.6600 x203
>Cel: 408.390.7614
>Fax: 408.496.6633
>email: raj.raghuram@xxxxxxxxxxxxxxx
>


Yuanqing Wang
State key lab of millimeter waves
Southeast University
Nanjing
China
email: yqwang@xxxxxxxxxxx

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