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Design >> Mixed-Signal Design >> audio DAC (multibit) specification
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Message started by Visjnoe on Aug 10^th, 2005, 10:42am

Title: audio DAC (multibit) specification
Post by Visjnoe on Aug 10^th, 2005, 10:42am

Hi,

I have a conceptual problem with the specification of a delta-sigma, oversampling (audio) DAC. Such a DAC features an 'internal' multibit DAC, e.g a switched-capacitor bank, preceeding the reconstruction filter.

Now, the noise of such a switched-cap DAC is given by kT/C.
However, for an oversampling ADC, you gain C because of the oversampling ratio (OSR). So, the noise would become kT/(C*OSR).

I was wondering if this also holds true for the DAC (internal)?

Kind regards

Peter