supermosfets!

sewerin · 16th March 2010, 07:52 PM

Mr. Pass! RD100HHF1, RD70HVF1,RD60HUF1.
Сiss<300pF, 520mHz!, P>100W, I>20А.

woody · 16th March 2010, 08:47 PM

Have you checked the prices on some of those? One I looked up was $109.67 each!
I will stick with the Simisouth power jfets!

event horizon · 16th March 2010, 08:56 PM

Why would you want to use an RF mosfet when normal devices are already fast enough?

Nelson Pass · 16th March 2010, 10:30 PM

Because you can?

godfrey · 17th March 2010, 02:38 AM

Quote:

Originally Posted by Nelson Pass

Because you can?

Uh-oh! At this rate he's never going to get done with The Beast.
Distractions BAD.

jcx · 17th March 2010, 04:10 AM

IXYS RF: HF/VHF Linear MOSFETs

TO-220/247, TO3P packaging probably limits FR

by using RF packaging and metal gate mosfets you could extend loop gain intercept and audio frequency feedback factor by 10X - assuming single pole compensation

of course I don't know why you'd bring that to Nelson's attention given his apparant lack of interest in high feedback designs

VladimirK · 17th March 2010, 04:25 AM

Quote:

Originally Posted by event horizon

Why would you want to use an RF mosfet when normal devices are already fast enough?

When I talked to experienced tube amp designers, they refused to think about using power MOSFETs because of their large non-linear input capacitance. Of course, an experienced designer could deal with any parts, but at expence of some compromise. What is proposed in this thread, is just a step towards less compromise design.

gearheaddruid · 17th March 2010, 04:42 AM

Seems to me you could build some major watts per cubic inch class D with those rf devices. The output choke would be so small.....

Nelson Pass · 17th March 2010, 08:53 PM

sewerin · 17th March 2010, 09:07 PM

rd100hhf1 40$,
rd60huf1 32$
rd70hvf1 33$
(in Russia rd70hvf1 ÝËÈÒÀÍ èíòåðíåò-ìàãàçèí ýëåêòðîííûõ êîìïîíåíòîâ)

16th March 2010, 07:52 PM	#1
sewerin diyAudio Member Join Date: Jan 2010 Location: Voroneg, Russia	supermosfets! Mr. Pass! RD100HHF1, RD70HVF1,RD60HUF1. Сiss<300pF, 520mHz!, P>100W, I>20А.

16th March 2010, 08:56 PM	#3
event horizon diyAudio Member Join Date: Feb 2008 Location: East Midlands, England	Why would you want to use an RF mosfet when normal devices are already fast enough? __________________ "Never let your morals prevent you from doing what is right!" Salvor Hardin

17th March 2010, 04:42 AM	#8
gearheaddruid diyAudio Member Join Date: Dec 2004 Location: Overland Park, KS	Seems to me you could build some major watts per cubic inch class D with those rf devices. The output choke would be so small..... __________________ Finding new ways for the extreme mis-application of high tech!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

16th March 2010, 08:47 PM	#2
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Have you checked the prices on some of those? One I looked up was $109.67 each! I will stick with the Simisouth power jfets!

16th March 2010, 10:30 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	Because you can?

17th March 2010, 04:10 AM	#6
jcx diyAudio Member Join Date: Feb 2003 Location: ..	IXYS RF: HF/VHF Linear MOSFETs TO-220/247, TO3P packaging probably limits FR by using RF packaging and metal gate mosfets you could extend loop gain intercept and audio frequency feedback factor by 10X - assuming single pole compensation of course I don't know why you'd bring that to Nelson's attention given his apparant lack of interest in high feedback designs

17th March 2010, 09:07 PM	#10
sewerin diyAudio Member Join Date: Jan 2010 Location: Voroneg, Russia	rd100hhf1 40$, rd60huf1 32$ rd70hvf1 33$ (in Russia rd70hvf1 ÝËÈÒÀÍ èíòåðíåò-ìàãàçèí ýëåêòðîííûõ êîìïîíåíòîâ)