nalysis and Design of Low Power SAR ADCs

• Main Authors: Wei-Cheng Hsieh, 謝為丞
• Other Authors: 盧奕璋
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/25410111833358559592

碩士 === 臺灣大學 === 電子工程學研究所 === 98 === In this thesis, the complete analysis of switching energy in different types of capacitor array of SAR ADCs has been derived. The 3 main types of capacitor array, conventional, attenuation, and C-2C structures are recommended to designers who have different requirements of power budgets. The proposed capacitor array saves 25.39% of switching energy compared to the attenuation structure and 95.7% compared to the conventional structure in 10bit resolution cases. A 10bit, 1MS/s single-ended SAR ADC with the novel capacitor array is designed for bio-medical applications. Simulation results of the proposed ADC show the average power is 3.43 W and the ENOB reaches 9.65 bits within the Nyquist rate. The FOM is as low as 5.1fJ/conversion-step using the TSMC 90nm process.