A digitally self-calibration method with recursive DFT algorithm for 12-bit SAR ADC realization

Yi Hsiang Juan, Hong Yi Huang, Shuenn Yuh Lee, Shin Chi Lai, Wen Ho Juang, Ching Hsing Luo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This paper presents a digitally self-calibration method with a recursive discrete Fourier transform (RDFT) algorithm for successive approximation (SAR) analog-to-digital converters (ADCs). A behavior model of 12-bit SAR ADC based on Matlab Simulink is proposed to combine with the compensation algorithm and digital input testing signal. In addition, the SAR ADC error caused by 1% capacitor mismatch of the DAC array is also built for evaluation of the real radixes of the DAC capacitor array. The proposed digital calibration method utilizes a RDFT to detect the third harmonic distortion value and to evaluate the error factor by using the calibration formula. Then, the error factor is applied to generate a new digital output code for the targeted SAR ADC. Under the sampling rate of 126.26 S/s, the simulation results reveals the third harmonic distortion is -47.98 dB before calibration and -84.34 dB after calibration with 1% capacitor mismatch. In addition, the SNDR and ENOB can be enhanced to 20.9 dB and 3.52 bit, respectively. Therefore, the proposed method can be adopted to enhance the performance of the ADC for various applications in the future.

Original languageEnglish
Title of host publication2016 International Conference on Applied System Innovation, IEEE ICASI 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467398886
DOIs
Publication statusPublished - 2016 Aug 10
Event2016 International Conference on Applied System Innovation, IEEE ICASI 2016 - Ginowan City Okinawa, Japan
Duration: 2016 May 282016 Jun 1

Publication series

Name2016 International Conference on Applied System Innovation, IEEE ICASI 2016

Other

Other2016 International Conference on Applied System Innovation, IEEE ICASI 2016
CountryJapan
CityGinowan City Okinawa
Period16-05-2816-06-01

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Computer Science Applications
  • Control and Systems Engineering
  • Social Sciences (miscellaneous)
  • Business, Management and Accounting (miscellaneous)
  • Electrical and Electronic Engineering
  • Control and Optimization

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