A 0.45mW 12b 12.5MS/s SAR ADC with digital calibration

摘要

This paper presents a digitally calibrated 12bit 12.5-MS/s successive-approximation-register (SAR) analog-to-digital converter (ADC) intended for low-power wireless communication and medical instrumentation. The performance of the proposed prototype is enhanced by two techniques. A power saving strategy is proposed. Also, several foreground calibration methods for SAR ADCs are proposed to reduce the power dissipation and enhance the conversion accuracy. The design was fabricated in the GlobalFoundries 40 nm CMOS technology. Measurement results showed that after calibration a SFDR of 87.5 dB and a THD improvement of 24.3 dB were achieved.