MOSFET output stage
On Sep 18, 5:05*am, "Arny Krueger" wrote:
wrote in message
On Sep 17, 6:12 pm, RichD wrote:
Who do MOSFET sound better than bipolar, as an audio amp
output driver?
MOSFETS HAVE WIDER BANDWIDTH ,less phase shift , lower
odd harmonic distortin. on and on.
Not in any relevant way for audio power amps.
This is not true.
The phase shift in the output section of a power amplifier is a
significant issue. If you want to have much of a gain sacrifice
factor in the audio band, the gain cross over point will be well above
the audio band.
NFB can't make a silk purse out of a sows ear. It can only lower the
distortion by about the gain sacrifice factor. This makes if better
to start with a low distortion topology.
Rumors aside MOSFETs are not really easier to operate in parallel.
You still need emitter / source resistors.
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