Posted By
Bionic
on 2007-01-08
15:31:03
|  Re: SID-supported software ???
TLC:
I have to disagree a bit. My signal processing class was some years ago, but if I remember correctly than the idea behind a sigma-delta DAC is that you use signal processing to move the quantization noise up in frequency. Therefore you need much less than 2^16 times oversampling to get an acceptable SNR for 16bit and thus less clock rate than the PWM approach. Also the first analog part behind the DAC is a low pass filter, so I do not really see the issue with the slew rate.
AFAIK the DTV is manufactured in a 0.35 micron process which would easily allow multiple 100MHz clock frequency (Think Pentium II/AMD K6). I would rather guess that Jeri did not implement a very good DAC. Chip space limitations and a bad low pass filter may also be issues..
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