[SI-LIST] Re: how to model frequency dependent resistor using hspice?
- From: Raj Raghuram <raj.raghuram@xxxxxxxxxxxxxxx>
- To: wyqdustin@xxxxxxxxxxx
- 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
>
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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
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