Sigma Delta Modulator A/D

I have read a bit about oversampling. Understand most of the theory but
get stuck at the easy bit. If we sample with one a one bit ADC - how do
we get 16 bits back from this single bit to do the processing? 

Naebad

naebad wrote:

> I have read a bit about oversampling. Understand most of the theory but
> get stuck at the easy bit. If we sample with one a one bit ADC - how do
> we get 16 bits back from this single bit to do the processing? 
> 
> Naebad
> 
The Sigma Delta ADC uses a one-bit ADC that's coupled to a one bit DAC 
and integrator feedback.  The feedback forces the low-frequency error of 
the ADC signal to be low.  Getting back to 16 bits (or 24) is simply a 
matter of lots of low-pass filtering which can be done accurately and 
cheaply in the digital domain, and is usually done inside the ADC.

-- 

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com