how the delta sigma output is converter to binary form

hello
the output of the delta sigma modulator is a series of pulses of 1 and -1
so how does the final output is in the binary(bcd form) form.
what is the role of the integrator in the delta sigma modulator
how does the integrator remove quantization noise



		
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cmos_189 wrote:
> hello
> the output of the delta sigma modulator is a series of pulses of 1 and -1
> so how does the final output is in the binary(bcd form) form.

The output of the modulator is low-pass filtered.

> what is the role of the integrator in the delta sigma modulator
> how does the integrator remove quantization noise
> 
The integrator does not remove quantization noise, it just shapes the 
noise spectrum to put the noise power at as high a frequency as 
possible.  Its the low-pass filter that actually gets rid of the noise.

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Tim Wescott
Wescott Design Services
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