MOS Power Amp -My Design

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Bob Scott

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Joined 2009
#1
Here's a simple MOSfet amp I designed. No bothersome bias adjustments!😎

Bob
 

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#4
soekris said:
.... Just bothersome handselecting parts as those mosfets have VGS(th) from 2V to 4V....

Soren
Click to expand...

Ah, I see that now in the data sheet. Thanks for the tip. I see in IR's app notes, they do not recommend their MOSFETs use in analog amplifers due to the non-linearity. I say cure it with massive feedback. I think I'll add a unity gain op-amp just to linearize the output. Full speed ahead!

I will test a few Z44s with a 15V source and a 1K resistor. With the two in series and the gate connected to the drain, we'll see how much the gate voltages differ. Will the currents vary ~ 13-15mA? We'll see.

I don't think it will be much to worry about. I see MOSFETs wired in parallel all the time without regard to "turn-on voltage".
 
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