A 1.8 V 14 b audio front end codec for digital cellular phones

The next generation of portable phones requires electronic components that work with a lower supply voltage than that of present commercial products, to reduce power consumption and increase battery life. This 1.8 V, 7 mW cell includes all basic blocks of an audio codec for portable phones in 2.7 mm/sup 2/, using a 0.35 /spl mu/m, 5-metal double-poly technology. The cell satisfies the requirements that come from super-integration, such as portability and digital noise rejection, because it is placed in a digital system-level chip.