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Comparison Nyquist Rate vs. SD AD<br />

Nyquist Rate ADCs Sigma Delta ADCs<br />

High voltage domain resolution Low voltage domain resolution<br />

in extreme case only 1 bit<br />

Low time domain resolution<br />

f s f Nyquist ( x 2-10)<br />

Low to medium resolution<br />

..(high)<br />

Stephan Henzler Mixed-Signal-Electronics 2012/13<br />

High time domain resolution<br />

f s >> f Nyquist ( x 64-512)<br />

Very high resolution<br />

up to 20 bit<br />

Result can be directly used Large decimation filter required<br />

One output symbol = one sample One sample distributed over many<br />

output symbols<br />

Medium speed requirements for all<br />

circuit block<br />

Very high speed requirements for<br />

OpAmps, DAC, etc.<br />

277

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