I have a next generation coming along to run my company. You?
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
I not only have "next", but "next-next" in the hopper.
The difference is my "next" or "next-next" will be an academic... yours will be a turd >:-} ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| 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.
You're going to trust your retirement income, and your technical legacy, to an academic? That should be interesting.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
-- As part of a nice, inexpensive library of well-thought-out and executed parts, I suspect the big bucks would result from the volume of sales of those libraries. Your mindset of selling a few expensive niche products probably keeps you from seeing that, and is what'll keep you out of the big time.
-- The only reason you'd say that is because writing a model is beyond your ken and you pooh-pooh the effort in an attempt to make achieving the goal seem less than worthwhile instead of unattainable. JF
I can write Spice models, but I don't as often as Jim does. As someone here has profoundly said, design is the opposite of analysis.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
Some people, like Modelithics, are in the serious model-selling business. Email them and see if they have an NE-2 model.
I'm in the big time. Look at my web site.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
Well-executed parts, like the simple NE-2, or a 4046 that really works, are simply advertising "teasers" to elicit requests to model nasty systems, or modeling an OpAmp to match the real world. ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| 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.
-- What would that prove?
Go ahead and ask them. They will be amused.
Agilent is a major OEM customer of ours.
I decided long ago that
I never wanted my company to get above 30 employees, and want everyone to know everyone else by first name. I set a limit on number of employees, but no limit on revenue per employee.
Everyone is polite and respectful to everyone else. Everyone is highly skilled at what they do. Everyone enjoys what they do. That implies careful hiring and some inevitable culling.
The revenue will be shared, through good pay, benefits, and bonuses for everyone.
We give customers the best support that we can, even when it doesn't make money in the short term.
We will do moderate volume, high-performance niche business (picosecond timing, precision measurement, complex controllers, photonics) and charge a lot for our products, on the basis that we sell IP, not just parts on boards.
So, we're just where I want us to be. I get to play with electronics and brainstorm with other engineers and customers, which I couldn't do if the company was a lot bigger.
Consider the signal path between our PCs. There are CPUs, DRAMS, video controllers, network adapters, modems, routers, all sorts of chips in the path. Maybe half of those chips (specifically the nanometer stuff) are fabbed using
193 nm deep UV light sources that are fired by our controller. Is that little-league stuff? On EUV, the 13.5 nm light sources, we fire 100% of the units in production.Ever fly on a plane with a Pratt&Whitney engine?
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
Modeling an NE-2 sounds like negative advertising.
People like Modelithics have tons of serious frequency and time-domain (I know!) equipment, and measure the hell out of parts before they make and verify their models. If you really want to model an NE-2, you might consider actually experimenting with some.
I was just talking with a local university. They have an Agilent temperature-controlled probe station for measuring bare ICs and small packaged parts, to close the loop on fab and modeling. They don't have the capacitance module, so I think we'll buy one for them, in return for having students occasionally characterize microwave parts (diodes, transistors, MMICS) for us for time domain apps. We might meet kids who could wind up being interns and maybe employees.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
I can't tell if you're being purposely coy, or if you've missed Phil's point.
Gas discharge devices like neon lamps have hysteresis: when they're on, they'll conduct at a lower voltage than their turn-on voltage.
So a simple I-V curve doesn't cut it, unless you're only trying to simulate the device in the on state, and leaving the user out to dry for figuring out turn-on and turn-off behavior.
-- Tim Wescott Wescott Design Services http://www.wescottdesign.com
He's just told you how clever he is.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
If you can model the off-state and on-state behaviour, then at speeds slow compared with the recombination time, you can get by with a 1-bit memory telling you which model to use. It's easy to patch that up with a tanh or the equivalent to make the switch soft.
LTspice does that for you if you specify a negative hysteresis voltage.
Cheers
Phil Hobbs
-- 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
Wrong. You can write a monotonic equation where the variable is current (I) and the output is voltage (V).
Watch this space >:-} ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| 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.
Far cleverer than you'll ever be. ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| 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.
LTspice (and many other Spice variants) use "IF" statements which converge for crap. ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: Contacts Only | |
| 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.
Sure. But if you add them together using a switch with negative hysteresis, you'll get the nice smooth behaviour that helps convergence. LTspice uses arctan instead of tanh, which isn't as nice but usually works.
Asymptotic function theory uses the idea of neutralizer functions, which are cobbled together from erf(1/x) in the same way. They're even better theoretically since all their derivatives go to zero at the origin, so you can patch it to a straight horizontal line with no discontinuity in any order. Won't matter much for SPICE.
Cheers
Phil Hobbs
Cheers
Phil Hobbs
-- 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
-- Red herring. Your original question was: "So, who's going to pay you big bucks for a better model of an NE-2?", which I answered. Not content with that, you move the goal posts in an attempt at subterfuge.
-- If it's as difficult as you proclaim, then a good model would be like a feather in one's cap.
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.