Super duper hype fast FET driver?

of

lds

nt

gst

ming.

to

ls.

pent

why

who

Maybe

It was purely in reponse to krw's post. I didn't make the connection between Alabama and the Univeristy of Alabama at Huntsville until I needed a club to beat krw over the head with.

I've read the e-mails, and Fred Pearce's book about the affair - "The Climate Files"

formatting link
ed-pearce/

which - sadly - shows up the fact that Fred Peearce isn't scientifically trained and doesn't appreciate the extent to which scientists are trained to protect the integrity of the peer-reviewed literature, and is consequently critical of the - entirely justified - vigour of their response when it was contaminated by pseudo-scientific crap. It still makes it perfectly clear that the scientists involved weren't falsifying their results, or doing anything improper, though they certainly didn't like being persecuted by frivolous and malicious "freedom of information" demands from denialsts trawling for yet more propaganda-fodder.

My copy of the book is back in Nijmegen, so I can't give you chapter and verse.

they are Baptists - perhaps not

till

.

l as

Absolutely. But you aren't allowed to lie about yours results or be dilatory in collecting them just because they might lead to - say - a better alternative to dilation and curretage.

formatting link

which does seem to be roughly equivalent to what Christy and Spencer did - or rather failed to do when they should have done.

-- Bill Sloman, Nijmegen

Reply to
Bill Sloman
Loading thread data ...

143 lines of pompous bilge, none on the subject of fet drivers.

John

Reply to
John Larkin

John Larkin loves posting about fet drivers - he can make implausible claims about how fast and cheap his are, and pose as the expert electronic engineer that he wants to be accepted as.

As soon as the thread gets off topic, he loses this gratification, and throws his rattle out of the cot. What a pity. I'd feel a certain sympathy for his feelings of deprivation, if he didn't get so downright nasty when he's feeling deprived.

One that needs flushing.

-- Bill Sloman, Nijmegen

Reply to
Bill Sloman

John posts actual scope plots. So when he says that a transition happens in under one nanosecond and proves it with a scope plot I don't know what you mean by "implausible". Just because some people or datasheets say it can't be done does not mean it can't be done. Also, he can show the proof in revenue Dollars.

Now if someone had the opposite sex of the 2N7002 or a PNP with 15V+ and no "saturation hold" that would be great. The BSS84 and it's siblings ain't that hot.

--
Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

You think I faked the waveforms? Or the company? Or the awards?

If you ever went off-topic with anything new, it wouldn't be so bad. But you don't. You pick the same old things, and you never point out anything interesting or useful or funny, you only drone out insults.

You aren't interested in anything but yourself... and what a depressing subject.

Go back to your Baxandall circuit; you might get it to actually oscillate in another decade or so.

John

Reply to
John Larkin

Have you tried any pfets?

I haven't played much with pfets as really fast switches. Right, a complement to the 2N7002, push-pull against a 7002, with the same

12-cent gate drivers, would be interesting, and might solve your problem. Just ignore the shoot-through maybe.

I'll put that on my slow-day experiment list. All I need now is a slow day.

Why doesn't somebody make p-channel gaasfets? The world wonders.

John

Reply to
John Larkin
[snip]

If you find a useful complement to the 2N7002 please let me know. Thanks! ...Jim Thompson

[On the Road, in New York]

-- | 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

formatting link
| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Reply to
Jim Thompson

I did try the BSS84 a few years ago and the results were not enthusing.

A gold-doped BJT would be nice as well. However, I have not seen any commercially successful gold or otherwise doped PNP transistors. And I guess there ain't no market to write home about so I won't hold my breath.

Some day I'll have to see how the BFT92 and the BFG31 behave. But they are intended as amplifiers so they won't are about saturation effects. Trick to keep it out of saturation get old quickly when every pF and every thenth of an inch count.

--
Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

Oh I will. But don't hold your breath :-(

--
Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

Hell, just some cheap NPN arrays would be really nice. I can get cheap FET arrays but not bipolar, anymore. Cheap current source/sinks would be nice, too.

Reply to
krw

Voila:

formatting link

At around 50c not very cheap. If it needs to be cheaper you've got to shop in Asia.

formatting link
formatting link

All those aren't fast though.

That'll be a challenge, I don't think there's a market for those.

[...]
--
Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

$.50 wouldn't make me too happy (FETs arrays I'm using are $.10) but I could make it work. HOWEVER, "NPN Multi-Chip General Purpose Amplifier" says it all.

No useful specs.

"Very small package with two transistors."

Me? I don't need fast. ;-)

Evidently there isn't a market for transistor arrays, either. Perhaps not even a 2N7002 with a sex change. ;-)

Reply to
krw

Because the hole mobility is too low--holes in GaAs weigh a ton.

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
Reply to
Phil Hobbs

My mental model of a mosfet is an infinitely fast piece of silicon with some capacitance and wire bonds. So the limit on fast switching is mostly how hard you can drive the gate. Most fets can switch way faster than the datasheets suggest if you slam them hard enough. Unfortunately, my 600 ps mystery driver is only good for 6.5 volts maybe, which that will drive a 2N7002 to an amp or so, fast, but pfets usually need more drive to turn on hard. But I bet there's one out there somewhere.

A little DC pre-bias, just below threshold, can buy another volt or two of enhancement.

My experience using bjt's as this sort of fast switch has been disappointing. I even tried some 45 GHz SiGe parts, and they switched slow. Mosfets are much better, phemts are radically better.

Yeah. I'd experiment with finding a 2N7002 complement. Now you've got me interested.

I have the gear (pulsers, drivers, sampling scope) to experiment, if you come up with some candidate parts.

John

Reply to
John Larkin

Isaac Asimov had the fix for that. He used positrons.

John

Reply to
John Larkin

Small amounts of thiotimoline would have fixed your problem with the chronologically-challenged customer, too.

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
Reply to
Phil Hobbs

Perhaps, but given a certain situation you may choose different. There are many grey areas when it comes to these sort of decisions. The bottom line is that you are in no position to choose what is best for someone else.

Last month my grandfather asked the doctors to end his suffering. After carefull consideration they decided to grant his wish. If there is one thing I've learned from how my all of my grandparents passed away is that becoming very old is not some holy grail or a pot of gold at the end of the rainbow. I didn't like the idea ofcourse but I could understand his desire so I did not ask him to reconsider. It still is very strange to say goodbye to someone who will die shortly afterwards.

Life is what you make of it, but if you have nothing to begin with then there is no life at all.

--
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
nico@nctdevpuntnl (punt=.)
--------------------------------------------------------------
Reply to
Nico Coesel

RF transistors are also a problem if they can't get to an amp or more. Usually you'll need that to swish charges around in a capacitive load. LDMOS can pulse nicely but the price tag is usually prohibitive. NPX isn't very useful there either because they won't release SPICE model. But PolyFet in Camarillo does.

This one could be a contender but it's Infineon and seems close to unobtanium, in which case it would not do too much good:

formatting link

--
Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

Well, you didn't say monolithic :-)

That is normal with many Asian suppliers, got to get used to it and test a lot for yourself. You can sometimes obtain additional data from them but sometimes you'd have to be married to the CEO's cousin's daughter or something like that.

Lucky you :-)

Almost all my stuff is RF nowadays.

No, there sure ain't :-(

--
Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

I didn't say that. I said I am personally against it. So, naturally, I wish my tax Dollars not be used for that either. If someone commits a sin it is not up to me to judge them but it is up to me not to support that. Just like I do not support free drug use.

Of course there will always be triage type situations where there are only two choices, between the yet unborn's survival and the mother's survival. That's very different. What I meant was "doing it" and then, whoops, "got to get rid of it". That is a grave sin.

I won't judge anyone who does that, that's not up to me. Personally I would not do it because it is squarely against biblical teaching, and I try to live by that.

You mean abortion with that? Ever looked at an ultrasound before "legal" abortion deadline? I have, I design part of those machines.

--
Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

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.