title: A 13-bit Noise Shaping SAR-ADC with Dual-Polarity Digital Calibration.
abstract: We present a new noise shaping method and a dual polarity calibration technique suited for successive approximation register type analog to digital converters (SAR-ADC). Noise is pushed to higher frequencies with the noise shaping by adding a switched capacitor. The SAR capacitor array mismatch has been compensated by the dual-polarity digital calibration with minimum circuit overhead. A proof-of-concept prototype SAR-ADC using the proposed techniques has been fabricated in a 0.5-μm standard CMOS technology. It achieves 67.7 dB SNDR at 62.5 kHz sampling frequency, while consuming 38.3μW power with 1.8 V supply.
authors.affiliation: School of Electrical and Computer Engineering, Georgia Institute of Technology.
authors.forename: Hangue
authors.initials: H
authors.lastname: Park
authors.forename: Maysam
authors.initials: M
authors.lastname: Ghovanloo
keywords: Analog-to-digital converter; SAR ADC; digital calibration; noise shaping