Paul,
A MESFET is maybe more similiar to a JFET than a MOSFET, but a distinct device none the less. There is a symbol, mesfet, that will netlist as a MESFET, but you will have to supply your own foundry models. For the parameter's supported in LTspice MESFET's see the help section
(key F1)=>LTspice=>Circuit Elements=>Z. MESFET transistor
--Mike
Hi,
Does LT support/recognise Mesfets (or GaAsFets)? I don't see any category within the standard library that appears to, unless they're just processed as Mosfets with different parameters... And while we're about it, what's the significance of the Lambda parameter in the Jfet model? I know it's "channel length modulation" but what exactly does that mean?
Thanks,
p.
-- "What is now proved was once only imagin\'d." - William Blake, 1793.
Channel length modulation is equivalent to the early effect in transistors. It makes the output a non ideal current source, that is there is a finite output resistance. That is, there is a slope on the Ids verses vds output curve. e.g. Idr=Id.(1+Vds.lambda)
Kevin Aylward snipped-for-privacy@anasoft.co.uk
Ta, Kev. On a largely unrelated matter, I was carrying out these parameter variations with LT by taking one of the stock models as a base, changing Beta and Vto and renaming the stock model with a suffix (a), (b), (c) and so forth. LT complained about the unrecognised character, so I renamed them without the brackets. So a 2N2222 became a 2N2222A for example. This time LT didn't complain, but changed the model numbers to 2N2223, 2N2224 & 2N2225! Bloody confusing that was! Now I think I know why Helmut said it's best not to place your own models in with the stock ones!
-- "What is now proved was once only imagin\'d." - William Blake, 1793.
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