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Guest

Fri Jan 11, 2019 3:45 am   



I'm making another fast pulse generator, shopping FETs, and
noticed a few possibly interesting gizmos:

RF MOSFETs. They're built for linear operation. At a glance, they seem
to have fairly beefy SOA curves. Up to 600V, too.

"N-channel enhancement mode linear RF power MOSFET
Ideal for class AB and C industrial, scientific, medical, and
commercial applications.
VDSS = 500 V ID25= 10 A"
https://media.digikey.com/pdf/Data%20Sheets/IXYS%20PDFs/IXZH10N50L2(A,B).pdf

More choices:
https://www.digikey.com/products/en/discrete-semiconductor-products/transistors-fets-mosfets-rf/285?FV=1280016%2C1f140000%2Cmu250V%7C2079%2Cmu270V%7C2079%2Cmu450V%7C2079%2Cmu500V%7C2079%2Cmu600V%7C2079%2Cmu700V%7C2079%2Cffe0011d&quantity=0&ColumnSort=1000011&page=1&pageSize=25

This little guy has Rth(jc) = .25K/W--pretty impressive.
http://ixapps.ixys.com/DataSheet/de275_501n16a.pdf

This EPC GaN is the FET of my dreams, but it only exists in
everyone else's dreams, too. (Spec'd since <2016, they're still
unexistium.)

http://epc-co.com/epc/Portals/0/epc/documents/datasheets/EPC2050_preliminary.pdf

This 650V part puts an enhancement-mode GaN FET in cascode with a
depletion-mode GaN JFET. It's real, and it's kind of interesting too:
https://www.transphormusa.com/en/document/650v-cascode-gan-fet-tph3206psb/

Cheers,
James Arthur

Clifford Heath
Guest

Fri Jan 11, 2019 5:45 am   



On 11/1/19 12:58 pm, dagmargoodboat_at_yahoo.com wrote:
Quote:
I'm making another fast pulse generator, shopping FETs, and
noticed a few possibly interesting gizmos:

RF MOSFETs. They're built for linear operation. At a glance, they seem
to have fairly beefy SOA curves. Up to 600V, too.

"N-channel enhancement mode linear RF power MOSFET
Ideal for class AB and C industrial, scientific, medical, and
commercial applications.
VDSS = 500 V ID25= 10 A"
https://media.digikey.com/pdf/Data%20Sheets/IXYS%20PDFs/IXZH10N50L2(A,B).pdf


Just 6dB gain at 40MHz - that's almost DC.

Clifford Heath.


Guest

Fri Jan 11, 2019 6:45 am   



On Thursday, January 10, 2019 at 11:26:23 PM UTC-5, Clifford Heath wrote:
Quote:
On 11/1/19 12:58 pm, dagmargoodboat_at_yahoo.com wrote:
I'm making another fast pulse generator, shopping FETs, and
noticed a few possibly interesting gizmos:

RF MOSFETs. They're built for linear operation. At a glance, they seem
to have fairly beefy SOA curves. Up to 600V, too.

"N-channel enhancement mode linear RF power MOSFET
Ideal for class AB and C industrial, scientific, medical, and
commercial applications.
VDSS = 500 V ID25= 10 A"
https://media.digikey.com/pdf/Data%20Sheets/IXYS%20PDFs/IXZH10N50L2(A,B).pdf

Just 6dB gain at 40MHz - that's almost DC.

Clifford Heath.


I skipped over the s-parameters, I was more interested in the
switching behavior.

It's a 500V FET with tr=3nS and tf=5nS @ Vdss=400V. That
was the interesting part. Plus a decent SOA curve.

Cheers,
James Arthur

Phil Hobbs
Guest

Fri Jan 11, 2019 6:45 am   



On 1/10/19 11:46 PM, dagmargoodboat_at_yahoo.com wrote:
> RF MOSFETs. They're built for linear operation. At a glance, they seem

Welcome back! You've been a bit scarce since last spring, iirc.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

Winfield Hill
Guest

Fri Jan 11, 2019 7:45 pm   



dagmargoodboat_at_yahoo.com wrote...
Quote:

This EPC GaN is the FET of my dreams, but it only
exists in everyone else's dreams, too.


Nightmare, 2x2mm passivated die with solder bumps.


--
Thanks,
- Win

Gerhard Hoffmann
Guest

Fri Jan 11, 2019 8:45 pm   



Am 11.01.19 um 02:58 schrieb dagmargoodboat_at_yahoo.com:

Quote:

This little guy has Rth(jc) = .25K/W--pretty impressive.
http://ixapps.ixys.com/DataSheet/de275_501n16a.pdf


That's probably what has become of Directed Energy.
They bought die from APT IIRC and put them into their
freshly developed stripline case.

They were the bee's knees some 15 years ago in ham radio
amplifiers but seem to have faded away, or I did not follow it
since my interest shifted to VHF+.

cheers, Gerhard

John Larkin
Guest

Fri Jan 11, 2019 8:45 pm   



On 11 Jan 2019 10:33:08 -0800, Winfield Hill
<hill_at_rowland.harvard.edu> wrote:

Quote:
dagmargoodboat_at_yahoo.com wrote...

This EPC GaN is the FET of my dreams, but it only
exists in everyone else's dreams, too.

Nightmare, 2x2mm passivated die with solder bumps.


We use them. They're really no worse than any other BGA chip. EPC
should offer little eval boards but for some reason don't. We made our
own.

Cooling can be a problem, getting heat out those tiny pads. Topside
cooling is a nuisance.




--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

Winfield Hill
Guest

Fri Jan 11, 2019 8:45 pm   



dagmargoodboat_at_yahoo.com wrote...
Quote:

This 650V part puts an enhancement-mode GaN FET in cascode with a
depletion-mode GaN JFET. It's real, and it's kind of interesting too:
https://www.transphormusa.com/en/document/650v-cascode-gan-fet-tph3206psb/


LMG3410R070, 600V 40A GaN, 100V/ns, integrated driver and protection.


--
Thanks,
- Win

Phil Hobbs
Guest

Fri Jan 11, 2019 8:45 pm   



On 1/11/19 1:33 PM, Winfield Hill wrote:
Quote:
dagmargoodboat_at_yahoo.com wrote...

This EPC GaN is the FET of my dreams, but it only
exists in everyone else's dreams, too.

Nightmare, 2x2mm passivated die with solder bumps.



Sure works though. Everybody uses them in incoherent lidars--iirc the
Osram triple-stack laser datasheet shows them.

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


Guest

Fri Jan 11, 2019 9:45 pm   



On Friday, January 11, 2019 at 12:44:48 AM UTC-5, Phil Hobbs wrote:
Quote:
On 1/10/19 11:46 PM, dagmargoodboat_at_yahoo.com wrote:
RF MOSFETs. They're built for linear operation. At a glance, they seem

Welcome back! You've been a bit scarce since last spring, iirc.

Cheers

Phil Hobbs


Hi Phil!

I've been doing some pretty fun things, but hobby-level
electronics, nothing I thought would be very interesting
for sed. I do still peek in to see what's happening.

Cheers!
James


Guest

Fri Jan 11, 2019 9:45 pm   



On Friday, January 11, 2019 at 1:33:33 PM UTC-5, Winfield Hill wrote:
Quote:
dagmargoodboat_at_yahoo.com wrote...

This EPC GaN is the FET of my dreams, but it only
exists in everyone else's dreams, too.

Nightmare, 2x2mm passivated die with solder bumps.


--
Thanks,
- Win


Since I'm wrestling wire-bond parasitics trying to get my
FETs /moving/, passivated die with solder bumps sounds fantastic.
I just wish they'd start delivering them!

Cheers,
James Arthur


Guest

Fri Jan 11, 2019 10:45 pm   



On Friday, January 11, 2019 at 2:23:15 PM UTC-5, Gerhard Hoffmann wrote:
Quote:
Am 11.01.19 um 02:58 schrieb dagmargoodboat_at_yahoo.com:


This little guy has Rth(jc) = .25K/W--pretty impressive.
http://ixapps.ixys.com/DataSheet/de275_501n16a.pdf

That's probably what has become of Directed Energy.
They bought die from APT IIRC and put them into their
freshly developed stripline case.

They were the bee's knees some 15 years ago in ham radio
amplifiers but seem to have faded away, or I did not follow it
since my interest shifted to VHF+.

cheers, Gerhard


Cool. An internet search for "vhf fet PA power amplifier"
brings up some interesting designs.

Here's one: n=77% @ 2 meters, 500W
https://www.researchgate.net/publication/309046370_ACKA_500_watt_power_amplifier_for_a_144_MHZ_channel_based_on_a_VHF_push-pull_power_mos_transistor

As expected, RF guys just resonate out bond wire inductances, something
I can't do when making fast pulses.

Cheers,
James Arthur

Cheers,
James Arthur


Guest

Fri Jan 11, 2019 11:45 pm   



On Friday, January 11, 2019 at 2:01:56 PM UTC-5, Winfield Hill wrote:
Quote:
dagmargoodboat_at_yahoo.com wrote...

This 650V part puts an enhancement-mode GaN FET in cascode with a
depletion-mode GaN JFET. It's real, and it's kind of interesting too:
https://www.transphormusa.com/en/document/650v-cascode-gan-fet-tph3206psb/

LMG3410R070, 600V 40A GaN, 100V/ns, integrated driver and protection.


--
Thanks,
- Win


That's very interesting for power conversion and solid-state drives.
Sweet.

I have to make accurate fast rectangular pulses with flat tops and
high edge timing accuracy, so for now I'm wary of having that much
complexity between my trigger and the output signal.

Thanks for the heads-up on a nice part.

(I posted the linear-mode FETs partly with you in mind--ISTR you
were interested Once Upon a Time.)

Cheers,
James Arthur

Tim Williams
Guest

Fri Jan 11, 2019 11:45 pm   



<dagmargoodboat_at_yahoo.com> wrote in message
news:7d99192c-fcde-4176-95d4-819c25ad0b6e_at_googlegroups.com...
Quote:
Since I'm wrestling wire-bond parasitics trying to get my
FETs /moving/, passivated die with solder bumps sounds fantastic.
I just wish they'd start delivering them!


??? EPC eGaN FETs have been around Digikey for half a decade IIRC!

Tim

--
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Design
Website: https://www.seventransistorlabs.com/

John Larkin
Guest

Sat Jan 12, 2019 1:45 am   



On Fri, 11 Jan 2019 13:40:22 -0800 (PST), dagmargoodboat_at_yahoo.com
wrote:

Quote:
On Friday, January 11, 2019 at 2:23:15 PM UTC-5, Gerhard Hoffmann wrote:
Am 11.01.19 um 02:58 schrieb dagmargoodboat_at_yahoo.com:


This little guy has Rth(jc) = .25K/W--pretty impressive.
http://ixapps.ixys.com/DataSheet/de275_501n16a.pdf

That's probably what has become of Directed Energy.
They bought die from APT IIRC and put them into their
freshly developed stripline case.

They were the bee's knees some 15 years ago in ham radio
amplifiers but seem to have faded away, or I did not follow it
since my interest shifted to VHF+.

cheers, Gerhard

Cool. An internet search for "vhf fet PA power amplifier"
brings up some interesting designs.

Here's one: n=77% @ 2 meters, 500W
https://www.researchgate.net/publication/309046370_ACKA_500_watt_power_amplifier_for_a_144_MHZ_channel_based_on_a_VHF_push-pull_power_mos_transistor

As expected, RF guys just resonate out bond wire inductances, something
I can't do when making fast pulses.

Cheers,
James Arthur

Cheers,
James Arthur


Right. That's why RF dmos fets aren't good for pulses. Some are
optimized for a specific RF band.

2 GHz is easy. DC to 2 GHz isn't as easy.


--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

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