I'm getting back to work on the biochip preamp, and I'd really like a more realistic SPICE model than the behavioural ones I cobbled together previously.
There are various models in the Avago literature for their ATF3x143 pHEMTs, but nothing that I can persuade LTSpice to swallow. They publish something called a Statz MESFETM1 model, as follows:
Any ideas for how to get all this wonderful info into a form LTSpice can digest?
Thanks
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
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
Thanks, gents. I did that already, as I should have mentioned. Even with default parameters only, it doesn't seem to know about anything resembling NMESFETM1 or STATZ_MESFETM1.
I saw what looked like a SPICE model for the ATF34143 (the big brother of my device), which called out a device "GAASFET", but LTSpice doesn't like that either. Using the NMF model, (which seems to be the vanilla SPICE way of doing a MESFET) a simple simulation sort of runs, but just about all the named parameters get rejected.
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
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
One option would be to take a similar FET that LTSpice does eat and compare the items line by line, parameter by parameter. If you get totally stuck the best forum for this is the Yahoo Groups LTSpice group, and there mainly Helmut Sennewald.
in is a cross reference. Spice2/3 and ADS Statz don't seem to have much in common.
Agilent ADS, Genesys, Microwave Office and some others support the Statz model. The handbooks apear to be on the net, so that should be a place to search.
It exists in PSpice as GaAsFET, Statz Model, Level=2. It's probably there in LTspice somewhere, Mike is pretty thorough about covering everything. ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 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.
Okay, after I gave up and resorted to Reading The Fabulous Manual, it sort-of works. A bunch of the parameters are missing from the LTspice version, but it claims to be based on the Statz model also, so it may be better than the behavioural version.
Quite ridiculously, it leaves out the flicker noise parameters.
Thanks, all.
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
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
LTspice apparently addresses MESFET/GaAsFET, but no models (For a possible model see below):
From LTspice Changelog:
02/07/04 Fixed a problem evaluating the MESFET saturation region.
02/17/02 Corrected some errors in MESFET current monitoring
From mesfet.asy:
Version 4 SymbolType CELL LINE Normal 16 12 16 84 LINE Normal 48 80 48 96 LINE Normal 48 16 48 0 LINE Normal 16 16 48 16 LINE Normal 0 80 16 80 LINE Normal 16 80 48 80 WINDOW 0 56 32 Left 0 WINDOW 3 56 72 Left 0 SYMATTR Value NMF SYMATTR Prefix Z SYMATTR Description GaAs MESFET transistor Note: You must supply the .model for this device PIN 48 0 NONE 0 PINATTR PinName D PINATTR SpiceOrder 1 PIN 0 80 NONE 0 PINATTR PinName G PINATTR SpiceOrder 2 PIN 48 96 NONE 0 PINATTR PinName S PINATTR SpiceOrder 3
Possibly useful link (maybe):
formatting link
Here's an NMOS depletion-mode model (Fairchild, BSIM) which might SCALE to match your needs:
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 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.
Thanks. Starting from where I am, scaling that model would be pretty time-consuming. However, Reading the Fabulous Manual probably got me there--I'm just putting the package parasitics in.
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
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
Maybe not, Just varying M and VTH0 works quite often for me.
Have fun ;-) ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 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.
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