Abstract
The paper contains a review of Sigma Delta ADC development with focus on multi-bit Sigma Delta ADCs. Both, achievements in the Sigma Delta area and driving applications are presented. Wireline communication products employ Sigma Delta ADCs extensively in voice band modems, ISDN modems and ADSL modems. Especially in the latter ones multi-bit Sigma Delta modulators are used. Design examples for ADSL modems are presented and recent advances, such as low voltage and deep sub-micron converters are discussed. An outlook on the developments of Sigma Delta ADCs for ADSL and VDSL is given, also covering some aspects of continuous time Sigma Delta ADCs.
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