A Second-Order High-Resolution Incremental A/D Converter with Offst and Charge Injection Compensation

A new structure of switched-capacitor AID converter is described, in which the effects of amplifier offsets and charge injection are compensated. Compared to a 1
^st
ordre structure, the use of a second order scheme allows a substantial reduction in the conversion time. Experimental results, obtained on circuits fabricated using a CMOS technology, indicate that 15 bit accuracy is easily achievable.