Delta-sigma ADCs in a nutshell

摘要

Delta-sigma converters are ideal for converting signals over a wide range of frequencies from dc to several megahertz with very-high-resolution results. Figure 1 shows the basic topology, or core, of a delta-sigma ADC, which has an internal delta-sigma modulator in series with a digital filter. As you explore delta-sigma ADCs, you will find that, although they have a variety of other features, they all possess this basic structure. This column and the next three Baker's Best columns explore the basic topology and functions of these two modules.