Re: phantom bypass caps


"Chris Hornbeck" <chrishornbeckremovethis@xxxxxxx> wrote in message
news:ooea33p9j0qnv6jjgnd86g1ke2repldb8r@xxxxxxxxxx
On Sun, 29 Apr 2007 20:02:50 -0400, "Soundhaspriority"
<nowhere@xxxxxxxxxxx> wrote:

While I've got your attention, is 120 dB the wall for dynamic range of
PCM
ADC ? Are there any that do better?

-120 dBu is 775nV, for audio bandwidth and room temperature
equivalent to about 100 ohms. -120 dBFS is somewhat lower.

More can be done, trivially by paralleling ADC's, or also
by higher power consumption and dissipation. There is no wall,
per se, except by commercial convention and cost practicalities.

Sure, but doubling the number of converters increases the s/n by only about
1 dB. The correlated voltages (signal) add by simple addition, while the
uncorrelated noises add by the Pythagorean rule: up x 1.4. A 10 dB
improvement would require 2^10 converters. So something more subtle would
have to be done :)

Bob Morein
Dresher, PA
(215) 646-4894


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