nalysis and Design of Low Power SAR ADCs
Date Issued
2010
Date
2010
Author(s)
Hsieh, Wei-Cheng
Abstract
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.
Subjects
low power
switching sequence
SAR
ADC
Type
thesis
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