A low-cost digital-domain foreground calibration for high resolution SAR ADCs. (March 2018)

• Record Type: Journal Article
• Authors: Guan, Rui; Jin, Jing; Zhou, Jianjun
• Is Part Of: Microelectronics journal. Volume 73(2018)
• Page Start: 86
• Page End: 93
• Publication Date: 2018-03
• Subjects: SAR ADC -- CDAC mismatch -- Digital calibration -- Redundancy; Microelectronics -- Periodicals; Microélectronique -- Périodiques; Microelectronics; Electronic journals; Journals - contents and abstracts; Periodicals; 621.3805
• DOI: 10.1016/j.mejo.2018.01.003
• Languages: English
• ISSNs: 0959-8324

Abstract

Abstract: A digital-domain foreground calibration method simultaneously correcting mismatch errors in main capacitive digital to analog converter (CDAC) and "segment error" between main CDAC and sub-CDAC of split-CDAC array in high resolution successive approximation register (SAR) analog-to-digital converter (ADC) is proposed. The actual weight is obtained with the digital-domain weight estimation algorithm. This proposed digital-domain calibration saves silicon area by eliminating the need for a dedicated calibration DAC employed in conventional CDAC mismatch calibration schemes. Behavioral simulation shows the proposed calibration is capable of correcting mismatch errors and "segment error" of split-CDAC array, and improving SNDR from 67.3 dB to 92.8 dB in a prototype 16 bit split-CDAC SAR ADC.