A Monolithic 20 bit Analogue-to-Digital Converter

This paper presents a monolithic 20 bit analogue to digital converter. The converter is implemented in a standard 2¿m N-well CMOS process and requires 14 mm
²
including the pads. Measurement results are presented which demonstrate the feasibility of a converter with 20 bit absolute accuracy. The complete converter has a power consumption of 6.7 mW.