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AHA: Newton Fit in a Subcircuit

Re: DIAC Spice Modeling

I was somewhat annoyed that my approximate solution to a transcendental equation either missed VF by about a volt or IP by

+50%.

So I mused, can I implement a Newton-Raphson solver in a subcircuit.

Yep. Here's how it's done...

The calculation of the parameters is implemented BEFORE simulation begins, thus the time penalty is nil (parameters are stationary during simulation). ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

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| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Reply to
Jim Thompson
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Cool! Except error connection refused on the link.

Also, yo mama's so fat even Newton couldn't fit her in a subcircuit!

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Reply to
bitrex

Server is in Connecticut... maybe the snow got the.

Huh? Is that a slur? ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

It's back on-line now. ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

The younger generation grew up absorbing a large oral history of "yo mama" jokes. Just trying to make my contribution... ; )

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Reply to
bitrex

"Yo' Momma jokes are, like, so old and stale and boring...just like yo' Momma." "Damn you and your free-form 'yo Momma joke."

Cheers

Phil Hobbs

(I heard a lot of those, raising children in the NYC 'burbs. The best one was, "Yo' Momma's so fat it takes you three trains and a bus to get on her good side.")

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net
Reply to
Phil Hobbs

formatting link
basically sums it up.

"Ya mama so fat..." "How fat is she?" "She can get busy with 22 burritos when times are rough. I seen her in the back of Taco Bell with handcuffs."

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Reply to
bitrex

Re: DIAC Spice Modeling

MyDIAC.zip, on the Device Models & Subcircuits Page of my website, has now been updated to include the Newton Solver in the DIAC model library. ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

Yes. It is annoying that typical parameters make any cunning approximations for a decent closed form solution more or less impossible.

Your simple starting guess is ingenious since the higher order terms would make it worse!

Cunning and elegant!

--
Regards, 
Martin Brown
Reply to
Martin Brown

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