Abstract
An intermittent-sleeping C–R hybrid D/A structure, a resistor-reusing R–C hybrid D/A structure and an R–C–R combined D/A structure are researched with theoretical analysis and Matlab modeling in this paper. The switching power and passive components' matching requirement of these D/A structures are discussed in detail. Three SAR ADCs with these three novel structures are realized based on SMIC 0.18μm CMOS, SMIC 90nm CMOS and UMC 90nm CMOS, respectively. The theoretical analysis, modeling verification and circuit realization proves the applicability of these three D/A conversion networks to high-resolution SAR ADCs.
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