On Tue, 17 Jun 2014 21:35:21 -0700, Jim Thompson
wrote:

On Tue, 17 Jun 2014 19:44:42 -0700, John Larkin
wrote:

On Tue, 17 Jun 2014 14:23:41 -0700, Jim Thompson
wrote:

On Tue, 17 Jun 2014 14:15:32 -0700, Jim Thompson
wrote:

On Tue, 17 Jun 2014 12:02:40 -0700, John Larkin
wrote:

On Tue, 17 Jun 2014 09:38:18 -0700, Jim Thompson
wrote:

Last time I tested several 2N7000 Spice models (2005), there was huge
variance between them, and some down-right non-physical behavior.

Has anyone found a better 2N7000 model since then?

...Jim Thompson

The 2N7000/2N7002 parts themselves vary a lot between manufacturers,
which is why some of our products specify a specific manufacturer for
these parts.

What non-physical behavior are you seeing?

All but the Supertex model failed to model ANY behavior below
threshold, and the Supertex model had discontinuities in the ID/VDS
curve blending... guaranteed to cause simulator convergence issues.

...Jim Thompson

I forgot to reference my old post (4/6/2005)...

http://www.analog-innovations.com/SE...7000Models.pdf

Second page tells it all.

...Jim Thompson

If you're actually designing boards with 2N7000s, any of those curves is about
as good as any other. Real-life parts will be all over the map.

You didn't notice the discontinuities?

...Jim Thompson

Sure, but they are down in the "noise" of part-part differences.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation