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Sigma Delta Modulator A/D

Started by naebad October 9, 2005
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