LT Spice diode model

Feb 18, 2013 1 Replies

Rate this thread:

John Larkin 13 years ago

Hi,

I'm adding a diode model, SMS7621-079, to the LT Spice standard.dio file. My diode data sheet shows Spice parameter Cjo = 0.1 pF, but the parts have a typical capacitance of 0.22 pF. I assume the extra capacitance is the package, which wouldn't behave like Cjo.

I don't see an obvious place, in the model script, for the package c. There are some "sidewall" params, but I don't know how they behave. I guess I could add discrete caps to my schematic, but that's inelegant.

There appears to be no way to specify diode inductance! I'd have to do that outboard, too.

Any thoughts?

(I'm designing a diode 2-input AND gate! I never took any digital design courses, but I recall seeing a diode AND on a blackboard as I walked pass the class in the hallway. I'd use the Hittite part, but it's almost $600.)

John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

Vote

josephkk 13 years ago

file. My

have a

package,

There are

could add

that

pass the

Oh come on. This modeling issue has been discussed. You must use the subcircuit modeling method to include the packaging parasitics.

?-)

Vote

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required