SPICE modeling of Plasma load

Jun 30, 2005 8 Replies
J

Hello,



I need some help.



I have been modeling the plasma load of my system using a crude RC circuit in SPICE. I would now like to replace this RC circuit with a set of differential equations which describe the vi-relationship of my load. I know SPICE is capable of doing this and it must be simple, but I can't find any resources specific to implementation.



I'm working with Orcad PSPICE 9.1 and the DE forms are like:



dx/dt = C1*v(t)^3/2 / x^2 - C2 i(t) = C3*(dx/dt+C2)



Any form of direction will be greatly appreciated.



Thank you.



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J

Refer to...

Newsgroups: alt.b>Hello,

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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R

Virtually by definition, a plasma is unstable, has negative resistance, and is non-linear. Have fun.

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J

Wine and bad comments on physical concepts are not what I'm interested in right now.

I'm simply asking about making a two port model with some differential equations as the engine.

Am I not in the right group?

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J

You probably had a response from someone I've plonked. Just ignore them.

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

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| 1962 | I love to cook with wine. Sometimes I even put it in the food.

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F

"Robert Baer" a écrit dans le message de news:dI6xe.2484$ snipped-for-privacy@newsread1.news.pas.earthlink.net...

^^^^^^^^^^^^^^^^^^^^^^^

What the hell does this mean?

Thanks, Fred.
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J

Thanks Jim, got your file. It will certainly help when syntaxing my equations. Now just to implement it all. I think the whole thing has to do with Analog Behavioral Modeling in PSPICE. I'll start looking there.

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K

I have a similar model and example circuit for a CCFL in SuperSpice. You could modify that one. You'll have to download the demo though:-)

Kevin Aylward snipped-for-privacy@anasoft.co.uk

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SuperSpice, a very affordable Mixed-Mode Windows Simulator with Schematic Capture, Waveform Display, FFT's and Filter Design.

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R

How about "by definition" then?

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