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Non Linear Pin Diode Model

Question asked by rfehn on Sep 22, 2003
Latest reply on Jan 16, 2004 by mlabro

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I do a lot of pin diode design, and realy miss a nonlinear model in Genesys.
I know there has been done some work on this for Spice.
Take a look at papers from Robert H. Caverly and Michael Quinn Villanova University.
" A Spice model for simulating the impedance-frequency characteristics of high frequency Pin Switching Diodes" , and " Spice modeling of Microwave and RF control Diodes"

Roy

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MZachmann Dec 29, 2003 4:08 AM
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Hi,
It's easy enough to add a spice model to Genesys. If you have a spice model for the pin diode then you're done. If you'd rather, you can use our new AMK (Advanced Modeling Kit) to write the code for a pin diode in Verilog-A. We provide diode code as a sample, so this should be pretty easy if you have GENESYS Enterprise and the AMK.

Mark Zachmann
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mlabro Jan 1, 2004 8:10 PM
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I posted several messages on other forum part to have some pin diodes models (linear and non linear). I think it could be a good idea to add some models (like for several npn rf transistors...) in standard genesys (ex:agilent or vishay or...). Like that, we could experiment some basic structures based on pin diodes.
It is not normal that on agilent website they publish aplac models for agilent HSMP diodes and Eagleware says that we can't do anything with it
and suggest no solution for it !
I have really no experience and no test fixtures for measuring linear and non linear models of a specified pin diode. It would be a waste of time, a risk of error and it is not my job.

Marc
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rfehn Jan 15, 2004 11:06 PM
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The Spice models includes controlled sources, wich Genesys dont support.
Do you have any plans to support controlled sources like Spice?
Roy
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mlabro Jan 15, 2004 11:37 PM
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Thank you for reply.

1. I don't understand your question "do you have any plan..."

2. Have you already simulated pin diode designs in Spice ?

3. If we forget distorsions and bias (Harbec), could Eagleware provide S-parameters of common pin diodes at different bias voltages. Perhaps Eagleware has good contacts with manufacturers like Agilent, Vishay,...
to have these data.

4. Do you think that Genesys will be one day able to process these control sources in order to simulate topologies based on pin diodes ?

5. By the way, dealing with unreadable spice files, do you think that this is the same problem for opamps (Analog devices, Linear Technologies, National,...) I can't simulate with Genesys ? Do cir (idem lib) files contain also current sources ? LT1227.lib works in Genesys but LT1013.lib doesn't. When I read binary LT1227.lib file with Textpad and compare with lt1013.lib, I see that lt1013.lib contains function like poly... I have seen in the spice manuals that these poly functions are involved in voltage/current controlled current/voltage sources,...

Marc
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smayna Jan 16, 2004 2:42 AM
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In a previous post, Mark mentioned "The Advanced Model Kit" (AMK) which is a Verilog-A nonlinear model development tool. This new capability is now supported in the latest release, 2003.10. It will allow you to create any nonlinear model that the Verilog-A supports. http://www.eagleware.com/products/AMK.htm

Relative to the PIN diodes, we have already created a PIN Diode model that uses the SPICE diode model approach documented in the Agilent app note using the AMK.

Additionally - to address one of the other questions - Genesys has nonlinear controlled sources available. Look up NLCCS in the help as an example.

Hope that helps![/url]
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mlabro Jan 16, 2004 3:10 AM
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Thanks for informations. To answer your question, perhaps it could help me depending of what I must do or purchase to use the models of agilent pin diodes and controlled sources you have developed.

I don't intend to spent time to create models by myselfs. It is perhaps very interesting for universities but not very affordable for a company.

So, I don't intend to purchase verilog because I am afraid not to have time for using it correctly.

Q1 : What can I do or purchase to use your models for agilent pin diodes ?

Q2 : you have developed controlled sources. Does it solve the problem to simulate LT1013 opamps ... ? If yes, what can I do or purchase to
be able to simulate opamps correctly ?

Marc
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Non Linear Pin Diode Model

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