LT Spice diode c-v

Feb 19, 2017 5 Replies
J

A diode model looks like



.model 1N4148 D(Is=2.52n Rs=.568 N=1.752 Cjo=4p M=.4 tt=20n Iave=200m Vpk=75 mfg=OnSemi type=silicon)



If I want to model some other diode c-v curve, I can edit Cjo as needed. But what parameter would change the shape of the curve, how c declines with voltage?



I'm modeling a weird photodiode and I can get close to the actual datasheet values, but the shape is a little off.



John Larkin Highland Technology, Inc lunatic fringe electronics
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L

ave=200m

Fc?

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J

Fc is a forward-bias parameter. I could try things, but I was hoping some guru would know.

John Larkin Highland Technology, Inc lunatic fringe electronics
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J

This looks like it, sheet 15:

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John Larkin Highland Technology, Inc lunatic fringe electronics
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J

Use the "idealized" model at your own peril. ...Jim Thompson

| James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Thinking outside the box... producing elegant solutions.
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J

M, FC, VJ...

...Jim Thompson

| James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Thinking outside the box... producing elegant solutions.
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