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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Minority carrier lifetime posted by Leisure7 on May 19, 2003 at 23:41:17:
What they are talking about here is excess minority carriers, not thermal effects. The carrier density in the base of a bipolar transistor depends only on the present level of injection under the quasi-static assumption, but a rapid decrease in base drive requires the excess carriers to recombine (or be swept out by the field) since they are no longer needed to support the current. Until they go away, they affect the interelectrode capacitances of the transistor and the phase margin of the amplifier using it for gain.Yes, I'm aware of the phenomenon.
However as far as I'm aware, the Lavardin circuit is based on the Perrot patent, which deals with thermal distortion. In fact, he reiterates the thermal aspect in his second patent, 5365874, when he states:
modifications of base-emitter voltage of the transistors resulting from variations in temperature of their junctions related to variations in the power dissipated in these transistors as a function of the amplitude of the signal
Perrot is the man behind Lavardin and authored their AES preprint (4282), "Measurement of a Neglected Circuit Characteristic."
So if what they're talking about are excess minority carriers, it's not evident in any of their approaches which deal with "memory distortion." And in either case, their claim of having discovered it is still a load of horseshit. Which is yet another example of why high-end audio is so often looked at as a technological backwater.
Where else can someone "discover" something that's been known outside of high-end audio for as much as a century or more (I'm not talking about these issues specifically) and be hailed as a visionary genius? Well, I guess most Americans still think Columbus "discovered" America, which I'm sure would have come as quite a surprise to those who met him on the shore. :)
se
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Follow Ups
- Re: Minority carrier lifetime - Steve Eddy 01:48:31 05/20/03 (0)
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