PSpice Component

[Michael A. Powers]

Hello,

I'm looking to make a model of an Avalanche Photodiode in PSpice. I have
the student version 9.1

The way I think of it, I can have a fake digital input into the component to
trigger an avalanche as if a photon hit it, and just have the resistance be
zero after that rising edge until the voltage across the diode drops to a
sufficiently low value.

Does anyone know of a component like this? Could someone give me advice or
perhaps direct me to a tutorial?

Thank You,

-Michael

 

[Jim Thompson]

On Fri, 16 Jul 2004 15:00:39 -0400, "Michael A. Powers"
<mapowers@umd.edu> wrote:

Hello,

I'm looking to make a model of an Avalanche Photodiode in PSpice. I have
the student version 9.1

The way I think of it, I can have a fake digital input into the component to
trigger an avalanche as if a photon hit it, and just have the resistance be
zero after that rising edge until the voltage across the diode drops to a
sufficiently low value.

Does anyone know of a component like this? Could someone give me advice or
perhaps direct me to a tutorial?

Thank You,

-Michael

Here's a tutorial on modeling tunnel diodes....

http://www.orcadpcb.com/pspice/applicationnotes/tn15.asp?bc=F

You can possibly manipulate that model to suit your needs.

You could also make an idealized behaviorally-modeled Schmitt trigger.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

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

 

[Brian Howie]

"Michael A. Powers" <mapowers@umd.edu> wrote in message
news:cd98kr$1bs$1@grapevine.wam.umd.edu...

Hello,

I'm looking to make a model of an Avalanche Photodiode in PSpice. I have
the student version 9.1

The way I think of it, I can have a fake digital input into the component
to
trigger an avalanche as if a photon hit it, and just have the resistance
be
zero after that rising edge until the voltage across the diode drops to a
sufficiently low value.

Does anyone know of a component like this? Could someone give me advice
or
perhaps direct me to a tutorial?

It's a complex subject and it depends exactly what you want to model - I've
been at it for 30 years and still don't have good models.

The definitive paper is " Properties of Avalanche Photodiodes" ,Webb,
McIntyre and Conradi RCA Review June 1974

There is an equivalent circuit and some equations on p 272 of the above.

It is a statistical process - there are some equations here :-
http://www.co.it.pt/~slug/research/optical_CDMA/final_report/node16.html



Brian

--
Brian Howie
BAE SYSTEMS Avionics Limited
Sensor Systems Division
Crewe Toll Phase II, 1st Floor,
Edinburgh EH5 2XS
Phone +44 (0)131 343 8769
FAX +44 (0)131 343 8941
Email brian.howie@baesystems.com