HEMT

There are quite a few PHEMTs around as discrete parts, and we use them. They switch blindingly fast, are well behaved, and typically need small enough gate drive, from off to slightly enhanced, that you can drive them from ECL or double-swing ECL, like a 10EL89 maybe.

Here are some in our stock list. But be warned that some are EOL or gone for good. NEC has been EOLing a lot of cool gaas parts, probably because wireless stuff is increasingly integrated.

The last three are still in production and are very cool parts.

These fets are usually characterized as RF parts, so you get lots of S-parameters and noise data, but usually very bad DC specs. I generally test them myself for things like DC transfer curves, breakdown voltages, and capacitances.

PHEMTS will usually enhance about 2:1 from Idss, with a few tenths of a volt positive on the gate.

John

I got this far and thought 5v 400 megawatts??

NT :)

That's only 80 million amps. You got a problem with that?

All our parts stuff is in uppercase!

John

And the hardware that it runs on is hand-flaked from lumps of flint.

-- Bill Sloman, Nijmegen

A dozen or so PCs, ethernet, and a Linux server, actually.

Our parts/BOM database program is in its third iteration. I wrote the first one in Microsoft PDS Basic, then PowerBasic + Lantastic, and the latest one is PBCC, the PowerBasic console compiler for Windows; The Brat and a contractor coded the latest one. The database has not been corrupted in about 20 years now.

ftp://jjlarkin.lmi.net/MAX.jpg

We've evaluated a number of commercial products and never found anything this good. And it's *fast*.

What sort of software have you written lately?

John

I dont... I can imagine some poor student trying to pulse 5MW through a half watt part though.

Very 70s :)

NT

-> Cookies and JavaScript must me enabled to see mW rating .

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On a sunny day (Wed, 15 Jun 2011 17:46:53 -0700) it happened John Larkin wrote in :

See what damage programming in BASIC can do? ;-)

e of

fast

ou

ly

None. The last time I wrote any code would have been in 1977, if you don't count programming PLA's. I've talked to software people about the details of their code a lot more recently, and they kindly refrained from rolling around the floor laughing, but I'm aware that my software skills are on the rusty side.

But it still seems odd that a recent BOM/Database program would still be upper-case only.

Even Jan Pantelje seems to share my disquiet about this, and he and I rarely agree about anything.

-- Bill Sloman, Nijmegen

Ah, none. But at least you did that in lowercase.

The last time I wrote any code would have been in 1977, if you

When you and Jan disapprove of what I'm doing, well, it grieves me deeply. Measured in microns.

John

Some people program BASIC in lowercase. Can't imagine why.

And there are those weird europeans who write their last names in uppercase, as if they were shouting.

John

Nah, they just realize that their ancestors were way more impressive than they are, and want to emphasize the positive. ;)

Cheers

Phil Hobbs

On a sunny day (Thu, 16 Jun 2011 06:54:48 -0700) it happened John Larkin wrote in :

Funny, after so many years of no BASIC I tried some code from a prof he wrote in

New to me. Sometines uppercase is more readable?

On a sunny day (Thu, 16 Jun 2011 06:50:08 -0700) it happened John Larkin wrote in :

That reminds me of that old space Sci Fi series, where they used microns for time or something, always found that shocking. Series has been running again on RTL here.. Must have a mind block because of that bad use of units, cannot remember the name of it.

of

fast

Remember the Millenium Falcon, that made the Something run in 15 parsecs?

Heck, it's a rare journalist who understands the difference between a million and a billion, or between a kilowatt and a KWH.

And how can the navigator of the Enterprise specify a spherical target bearing with a single number? Maybe because all starships seem to travel in the same plane.

John

in 1997

Seems to be a French thing, like

Bernard RIONDET

Dominique MONNIER-BOURDIN

John LARKIN

(looks silly when I do it)

Not to mention the carburettors in the Imperial Tie Fighters, which always flipped over when changing direction. (Allied fighters did that in WW2 (and in movies) because otherwise the floats in their carburettors flipped up and they got shot down. Axis fighters had fuel injection and didn't need to do that.)

And don't forget the scene where Our Heroes climb out of the Millennium Falcon inside the asteroid--they didn't even notice the resulting explosive decompression.

And that asteroid snake thing...too much.

Cheers

Phil Hobbs

of

fast

Ironic that Sword and Sorcery yarns tend to be more believable than Science Fiction.

John

in

ne of

fast

you

bly

wrote in 1997

seems to be a french thing, tells you which is first name and family name they have some strange habit of writing family name first of "offical" things

as in: mr. LARKIN, John

-Lasse