Solid Solid State Power Amplifier

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I also add the results of measurements

100kHz.BMP

10kHz.BMP
 
indeed, a classical and very good topology..
the only drawback i could imagine is the differential input
common gate using irf s...bjts could make the work better..
and the differentials are connected in serial fashion through R1,
thus, the two symetrical stage are serial connected
even in ac mode...
isn t it better to use classical current generators connected
to the relevant supply lines?...
 
This is because the VCA driver devices have too much capacitance. 100V/us is possible with this design. I have made that number,100V/us, with this topology, for the last 35 years. In other words, the design is 'overcompensated'.
 
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