Propeller Head Plaza

RE: Yet another way of looking at it...

67.164.165.165

In Reply to: RE: Yet another way of looking at it... posted by rick_m on May 10, 2008 at 17:41:03

Hi Rick,

I just sent you an email through the Asylum system. You'll need to reply to that as Asylum email doesn't seem to support attachments.

"Another fun thing is the vagueness of "class AB". A lot of disparate topologies fall into that category and likely have different audible artifacts. That's why I'm curious what Self was using."

Yes, I agree. To make things more confusing, Self calls the optimum bias condition "Class B". But to me, class B means exactly 180 degree conduction angle, which is somewhat of a fiction. His analysis does indeed assume that the base "sees" zero impedance, so the impedance reflected to the emitter (=ZB/(beta + 1)) where ZB is the base impedance, is assumed to be zero.

He shows oscilloscope figures of distortion residuals of the underbiased, optimum bias and overbiased conditions in figure 14 on this page. I also have some LTspice sims of this that I could dig out. They use some models for the MJL3281A and MJL1302A that I describe here.

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