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Old 16th March 2010, 07:52 PM   #1
sewerin is offline sewerin  Russian Federation
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Default supermosfets!

Mr. Pass! RD100HHF1, RD70HVF1,RD60HUF1.
Сiss<300pF, 520mHz!, P>100W, I>20А.
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Old 16th March 2010, 08:47 PM   #2
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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!
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Old 16th March 2010, 08:56 PM   #3
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Why would you want to use an RF mosfet when normal devices are already fast enough?
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Old 16th March 2010, 10:30 PM   #4
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Because you can?

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Old 17th March 2010, 02:38 AM   #5
godfrey is offline godfrey  South Africa
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Quote:
Originally Posted by Nelson Pass View Post
Because you can?

Uh-oh! At this rate he's never going to get done with The Beast.
Distractions BAD.
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Old 17th March 2010, 04:10 AM   #6
jcx is offline jcx  United States
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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
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Old 17th March 2010, 04:25 AM   #7
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Quote:
Originally Posted by event horizon View Post
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.
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Old 17th March 2010, 04:42 AM   #8
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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.....
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Old 17th March 2010, 08:53 PM   #9
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Old 17th March 2010, 09:07 PM   #10
sewerin is offline sewerin  Russian Federation
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rd100hhf1 40$,
rd60huf1 32$
rd70hvf1 33$
(in Russia rd70hvf1 ЭЛИТАН интернет-магазин электронных компонентов)
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