Are there any advantages of driving either the outputs or the drivers with separate rails that are a few volts (eg +/- 4vdc) higher in BJT amplifiers?
I can see one advantage of decoupling the drivers and vas to get them a stable rail, but are there any other topological advantages that accord either more voltage swing or power or lower distortion?
I can see one advantage of decoupling the drivers and vas to get them a stable rail, but are there any other topological advantages that accord either more voltage swing or power or lower distortion?
You may win an extra peak Volt output, not sure you will reach 2V , bipolar BE drop is small, saturation too.
It´s worth doing on MosFets where you may lose 6 or 7V.
It´s worth doing on MosFets where you may lose 6 or 7V.
Some amps use filtered and or boosted rails for the pre output stages. Boosted so the output can go rail to rail, filtered to increase PSRR. It depends on design, some think the extra complexity is not worth it.
You can have big advantages in sound quality if you apply a quality power supply something high from output supply.
It goes beyond of the mere PSRR and a bit more of output power.
This was the reason of lots Hi End amplifier did it in the past.
When I write about a quality power supply I mean something as Walter Jung did. Just remember in one side he applied a clean voltage reference using low pass filters and in the voltage sample line he used capacitors to tale the power supply impedance working in feedback of gain element.
Of course it has a price ...
Regards
It goes beyond of the mere PSRR and a bit more of output power.
This was the reason of lots Hi End amplifier did it in the past.
When I write about a quality power supply I mean something as Walter Jung did. Just remember in one side he applied a clean voltage reference using low pass filters and in the voltage sample line he used capacitors to tale the power supply impedance working in feedback of gain element.
Of course it has a price ...
Regards
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