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RE: driver stage distortion @ 3W

Posted by dave slagle (M) on September 29, 2016 at 16:43:26

In Reply to: RE: driver stage distortion @ 3W posted by Triode_Kingdom on September 29, 2016 at 13:12:53:

I thought that too but then not being well versed in the evils of feedback I built the circuit in spice and the numbers came very close to what dt667 measured.

here is the fft of the driver and the output @ 2.8W out.

and here is the numerical rundown of the distortion

If I remove the feedback and decrease the input value to get the same power out we get the expected low distortion behavior from the driver but the overall circuit gets worse.

To keep things complete, the other important thing that changes with the feedback is the output impedance. As built, the Zout is around 2 ohms and if the feedback is removed the Zout jumps to just over 100 ohms.

dave

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