A capacitor-based D/A converter with continuous time output for low-power applications

Abstract

A digital to analog converter has been developed using switched capacitors as the basic DAC elements. The use of switching capacitors provides excellent matching without sacrificing die area, and allows for very low-power operation. However, the architecture provides significant challenges when used in a continuous-time application requiring a "smooth" output. A realization of this architecture in a standard 0.6 /spl mu/m CMOS process achieved 10 bits of linearity while consuming less than 200 /spl mu/A of current.