Lateral FET, Folded drivers, Biasing? - diyAudio
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Old 27th August 2011, 09:18 AM   #1
diyAudio Member
Join Date: Oct 2004
Location: Denmark
Default Lateral FET, Folded drivers, Biasing?

How do you bias Lateral FET's if you are using folded drivers, as per Cordells example in his book? Ofcourse his example shows Vertical FET's but that shouldnt matter.

The lowest bias I could get is around 1.8 A, that is 900mA per FET. Seems like regular Vbe muptiplier doesnt work, tried just a resistor, resistor+pot, various combinations of diodes and resistors, nothing seems to work.

Maybe I'm overlooking something.

Schematic attached.
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File Type: png LatFET-Folded.png (73.7 KB, 103 views)
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Old 27th August 2011, 07:12 PM   #2
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Join Date: Oct 2004
Location: Denmark
No one else using folded drivers together with Lateral FETs?
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Old 27th August 2011, 07:24 PM   #3
wahab is offline wahab  Algeria
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Join Date: Nov 2009
Location: algeria/france
Surely that there are some but with higher Vth mosfets, unless it is class A..
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