Posted By
Bionic
on 2007-01-07
17:56:45
|  Re: SID-supported software ???
oh, my previous reply to MikeD's posting.
tlc: Well, the problem is not only that it is a digital process, you also simply don't design that way using MOS transistors  Using a pass transistor in linear region as a voltage controlled resistor simply asks for trouble, especially in NMOS. My guess is that the filter is some kind of last minute addition. If you look at the layout you will also notice it is cramped in between the pads..
They fixed this in the 8580 by using proper circuit and layout techniques. But it came at the price of quite a bit of die area.
Also, "1-bit" D/A converters are much better than R2R if done right (sigma delta etc..). But I would not be surprised if Jerri used some kind of hack..
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