A cyclic A/D conversion technique with improved SFDR

Chun Hsien Kuo, Tai-Haur Kuo

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

4 Citations (Scopus)


This work proposes a random feedback-capacitor interchanging (RFCI) technique for cyclic analog-to-digital converters (ADCs) to reduce their harmonic distortion caused by capacitor mismatch without trimming and/or calibration, The proposed RFCI technique can be realized with the simple rearrangement of feedback capacitors of ADCs in different operation cycles. Hence, complicated circuits and extra calibration cycles are not needed. The RFCI technique improves upon the spurious-free dynamic range (SFDR) of conventional ADCs without sacrificing signal-to-noise-and-distortion ratio (SNDR) at Nyquist rate. Hence, the capacitor matching requirement is relaxed for high SFDR specification and the capacitor sizes can then be scaled down to fit SNDR specification, reducing the driving capability required for ADCs, thereby reducing the total power and area. An 1-bit/stage-with-extended-range architecture incorporating digital correction is adopted for analysis and in design examples. At 3-csσ level, 0.2% capacitor mismatch combined with 1.56%-of-full-scale comparator offset are adopted in Monte Carlo simulations. The simulation results show that the RFCI technique has 18 dB and 5 dB higher SFDR and SNDR, respectively, than the conventional technique for a 14-bit cyclic ADC.

Original languageEnglish
Title of host publication2007 International Symposium on Integrated Circuits, ISIC
Number of pages4
Publication statusPublished - 2007
Event2007 International Symposium on Integrated Circuits, ISIC - Singapore, Singapore
Duration: 2007 Sep 262007 Sep 28


Other2007 International Symposium on Integrated Circuits, ISIC

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Electrical and Electronic Engineering


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