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
Linear power FETs
Started by ●January 10, 2019
Reply by ●January 11, 20192019-01-11
On 11/1/19 12:58 pm, dagmargoodboat@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).pdfJust 6dB gain at 40MHz - that's almost DC. Clifford Heath.
Reply by ●January 11, 20192019-01-11
On Thursday, January 10, 2019 at 11:26:23 PM UTC-5, Clifford Heath wrote:> On 11/1/19 12:58 pm, dagmargoodboat@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
Reply by ●January 11, 20192019-01-11
On 1/10/19 11:46 PM, dagmargoodboat@yahoo.com wrote:> RF MOSFETs. They're built for linear operation. At a glance, they seemWelcome 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
Reply by ●January 11, 20192019-01-11
dagmargoodboat@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
Reply by ●January 11, 20192019-01-11
On 1/11/19 1:33 PM, Winfield Hill wrote:> dagmargoodboat@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
Reply by ●January 11, 20192019-01-11
dagmargoodboat@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
Reply by ●January 11, 20192019-01-11
On 11 Jan 2019 10:33:08 -0800, Winfield Hill <hill@rowland.harvard.edu> wrote:>dagmargoodboat@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
Reply by ●January 11, 20192019-01-11
Am 11.01.19 um 02:58 schrieb dagmargoodboat@yahoo.com:> > This little guy has Rth(jc) = .25K/W--pretty impressive. > http://ixapps.ixys.com/DataSheet/de275_501n16a.pdfThat'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
Reply by ●January 11, 20192019-01-11
On Friday, January 11, 2019 at 12:44:48 AM UTC-5, Phil Hobbs wrote:> On 1/10/19 11:46 PM, dagmargoodboat@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 HobbsHi 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
