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http://dx.doi.org/10.5369/JSST.2017.26.5.348

A 15b High Resolution Hybrid A/D Converter with On-Chip Filter  

An, Kyung-Chan (Dept. of Electronics Engineering, Seokyeong Unversity)
Lim, Shin-Il (Dept. of Electronics Engineering, Seokyeong Unversity)
Publication Information
Journal of Sensor Science and Technology / v.26, no.5, 2017 , pp. 348-352 More about this Journal
Abstract
In this paper, we propose a high resolution A/D converter for a sensor interface that processes low frequency AC signals. A 6b SAR ADC with low power consumption and a 11b incremental ADC with high resolution are combined together to perform 15b resolution. Conventional hybrid ADC has a disadvantage that it can convert t only DC signal, but in this paper, it is possible to convert data to AC signal by increasing input range of incremental ADC. The decimation filter is implemented on-chip. The designed Hybrid ADC operates at supply voltage of 1.8V and consumes the current of 6.98uA. The OSR (oversampling ratio) is 90. And SFDR, SNDR, ENOB and FoMs are 96.59dB, 88.47dB, 14.4-bit and 139.5dB, respectively.
Keywords
SAR ADC; Incremental ADC; Hybrid ADC; Oversampling ADC;
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