northumber82
Member level 3
As title, I'm searching a simple circuit to biasing vertical mosfets in an audio power amplifier.
The output stage I'm using, is composed by two simple mosfet IRFP240/9240 in push-pull configuration. Before that a buffered VAS. The problem is that the amplifier need to be used at variable power supply voltage and need to adapt to every load at output. With a simple Vbe Multiplier I can't do this. I know, there is already the LT1166, but: I do not want to use third party IC and want a simple circuit made basically of transistor and resistors.
I've already tried this, but the complexity is high and not working well in simulation.
Then I tried this, I don't know the meaning of "dual vas". In my amplifier, the VAS and the driver are the same thing.
The output stage I'm using, is composed by two simple mosfet IRFP240/9240 in push-pull configuration. Before that a buffered VAS. The problem is that the amplifier need to be used at variable power supply voltage and need to adapt to every load at output. With a simple Vbe Multiplier I can't do this. I know, there is already the LT1166, but: I do not want to use third party IC and want a simple circuit made basically of transistor and resistors.
I've already tried this, but the complexity is high and not working well in simulation.
Then I tried this, I don't know the meaning of "dual vas". In my amplifier, the VAS and the driver are the same thing.