This is cool:
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Drain is positive, source is positive, gate is negative!
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John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers
jlarkin att highlandtechnology dott com
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gate current
Mar 16, 2015
6 Replies
The NXP BF862 model gets the gate current all wrong. In other situations it's three orders of magnitude too high.
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
That's what happens when you employ PhD's with no hands-on experience to do device modeling >:-} ...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.
AFAICT the NXP modellers are probably technicians.
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
I notice that, too. The gate current around Idss seemed awfully high.
John Larkin Highland Technology, Inc
picosecond timing precision measurement
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
Nope, they're software types with no concept of convergence issues.
I see IF/THEN/ELSE statements and TABLE curve fitting in every model that is complained about on the LTspice List... guaranteed convergence problems. ...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.
Yup. I like to run them about 2-2.5V D-S, where the transconductance is high and there's no impact ionization gate current. They typically run about 1-2 pA at room temperature, even dissipating 50 mW.
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
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