Mosfet Power Amplifier 120W by K1058,J162


This amplifier evolved from the previous 6 transistor mosfet amplifier. That design was already so good there seemed no reason to look for improvements, but the high open-loop distortion at 20kHz and the resulting triangular ‘error voltage’ extracted suggested that the non-linear mosfet capacitance was responsible for almost all the distortion, and although the closed-loop distortion remains below 0.01% this could easily be reduced further by driving the mosfets from a lower impedance just by adding an emitter-follower.

Mosfet Power Amplifier 120W by K1058,J162

Source: http://www.angelfire.com/ab3/mjramp/amp7.html


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