I like class-b amplifiers for their effectiveness. If they are implemented as neatly as by LKA, all the more. Class-d are therefore also on my hit list, but two big advantages of class-b to class-d are: Not necessarily SMD and no hard high frequency.Looks nice and interesting, what's the main advantage of this topology?
The same goes for current dumping.
Personally, I'm currently working on a class b / c amplifier, in which the power transistors are switched on from a certain current. The low quiescent current is only caused by the driver and voltage amplification.
The final LeXaN buffer schematic (voltage amplification =1). I applied Technics synchronous bias technique to the outputs. The cross-over region is very smooth, though the idle bias is 3mA per pair. The circuit doesn't suffer from cross-conduction at high frequencies and output levels (the Achilles heel of almost all Class-B implementation).
Simulated THD <= 0.01% 0.1W-100W/4R
IMHO, this is the best Class-B output stage I have ever seen.
Simulated THD <= 0.01% 0.1W-100W/4R
IMHO, this is the best Class-B output stage I have ever seen.
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The final LeXaN buffer schematic (voltage amplification =1). I applied Technics synchronous bias technique to the outputs. The cross-over region is very smooth, though the idle bias is 3mA per pair. The circuit doesn't suffer from cross-conduction at high frequencies and output levels (the Achilles heel of almost all Class-B implementation).
Simulated THD <= 0.01% 0.1W-100W/4R
IMHO, this is the best Class-B output stage I have ever seen.
Very interesting and nice build LKA! What's the loop feedback of the circuit, could you show simulation graph and fft to see the harmonics content?
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