A 12-b 600 ks/s digitally self-calibrated pipelined algorithmic ADC.

This paper discusses fully digital error correction and self-calibration which correct errors due to capacitor mismatch, charge injection, and comparator offsets in algorithmic A/D converters. The calibration is performed without any additional analog circuitry, and the conversion does not need extra clock cycles. This technique can be applied to algorithmic converter configurations including pipelined, cyclic, or pipelined cyclic configurations. To demonstrate the concept, an experimental 2-stage pipelined cyclic A/D converter is implemented in a standard 1.6-mum CMOS process. The ADC operates at 600 ks/s using 45 mW of power at +/-2.5 V supplies. The active die area excluding the external logic circuit is 1 mm2. Maximum DNL of +/-0.6 LSB and INL of +/-1 LSB at a 12-b resolution have been achieved.