Open Access System for Information Sharing

Login Library

 

Article
Cited 39 time in webofscience Cited 50 time in scopus
Metadata Downloads

A Digital-Domain Calibration of Split-Capacitor DAC for a Differential SAR ADC Without Additional Analog Circuits

Title
A Digital-Domain Calibration of Split-Capacitor DAC for a Differential SAR ADC Without Additional Analog Circuits
Authors
Ji-Yong UmYoon-Jee KimEun-Woo SongSim, JYPark, HJ
POSTECH Authors
Sim, JYPark, HJ
Date Issued
Nov-2013
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Abstract
A digital-domain calibration method is proposed for a split-capacitor DAC (split-CDAC) used in a differential-type 11-bit SAR ADC. It calibrates the nonlinearities of SAR ADC due to the DAC capacitance mismatch as well as the two parasitic capacitances connected in parallel with each of the bridge capacitor and the LSB bank of split-CDAC. The proposed ADC does not require any additional analog circuits for calibration, because it utilizes one of the two split-CDACs to measure the error codes of the other split-CDAC. During the normal A/D conversion step, the 11.5-bit raw SAR code output of ADC is added to the pre-measured error codes to generate the 11-bit calibrated output code. The analog block of the ADC was fabricated in a 0.13-mu m CMOS process, and the digital block was implemented in a FPGA. The measured SNDR and SFDR are 61.6 dB (ENOB 9.93 bits) and 78 dB at the Nyquist rate with a 5 kHz sine wave input. INL and DNL are measured to be +0.96/ -0.98 LSB, and +0.96/ -0.97 LSB, respectively. This work extends the prior work by utilizing an additional 0.5-bit raw SAR code to eliminate the missing code, and by employing a temporal averaging with a FIR LPF to measure the error code reliably in spite of the supply noise.
Keywords
Analog-to-digital converter (ADC); digital-domain calibration; split-capacitor digital-to-analog converter (DAC); successive approximation register (SAR); SUCCESSIVE APPROXIMATION ADC; FRONT-END; CMOS; SENSOR; CHIP
URI
http://oasis.postech.ac.kr/handle/2014.oak/14994
DOI
10.1109/TCSI.2013.2252475
ISSN
1549-8328
Article Type
Article
Citation
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, vol. 60, no. 11, page. 2845 - 2856, 2013-11
Files in This Item:
There are no files associated with this item.

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher

 PARK, HONG JUNE
Dept of Electrical Enginrg
Read more

Views & Downloads

Browse