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Old 13th February 2002, 04:22 AM   #11
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Insulted Gate Bipolar Transistor.

MOSTFET on top of a bipolar transistor; used widely in power
switching circuits, not particularly useful in linear applications,
but it is done. Just doesn't seem to have any advantage over
separate MOSFETs or bipolars in audio amplifiers.
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Old 13th February 2002, 02:56 PM   #12
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What would one call this output configuration:
http://w1.521.telia.com/~u52107110/tr_monster.html

My unproven opinion is that a high bias class AB (1 or 2 amps) may be the solution as the switching transients could be swamped by the current draw of the other phase. Yes/No?
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Old 13th February 2002, 03:27 PM   #13
tvi is offline tvi  Australia
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<i>"What would one call this output configuration:"</i>
Hiraga Called it an Inverted Darlington I think

James
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Old 13th February 2002, 05:40 PM   #14
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In complementary output stages, I was brought up
to call it conjugate complementary. Sziklai I never
heard of.
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Old 13th February 2002, 06:18 PM   #15
Geoff is offline Geoff  United Kingdom
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James

Your recollection is correct. Hiraga also referred to this output stage configuration as 'Darlingnot'

dshortt9

If you want more than just the schematic for this design, the full original articles are on my website.

Geoff
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Old 13th February 2002, 07:27 PM   #16
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Thanks, Geoff. I've referenced your page before but have not kept up with the updates. Good Work.
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Old 13th February 2002, 09:44 PM   #17
sonnya is offline sonnya  Denmark
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Quote:
Originally posted by dshortt9
What would one call this output configuration:
My unproven opinion is that a high bias class AB (1 or 2 amps) may be the solution as the switching transients could be swamped by the current draw of the other phase. Yes/No?
Your opinion on CFP mathes norwegian Audio wich maked a DIY class A amplifier some years ago with a BJT CFP and Fet's in the inputstage.. No feedback.
But i think the class A bias was to high... Far higher than the outputstage could handle.... heatsink should be in the area of .2degress/watt per channel.

I think i still have the magazine... I can scan the article tomorow if anyone is interrested?


Sonny
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Old 20th March 2003, 07:19 AM   #18
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Hi Sonnya,
Could you please scan the article. Thank you.

I was planning on testing a CFP pair with bipolar input and MOSFET power device and MOSFET input and Bipolar output device. Has anyone compared these in class A or class AB mode ?
Cheers.
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