Journal
IEEE ACCESS
Volume 7, Issue -, Pages 19013-19023Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2019.2896756
Keywords
Analog-to-digital converter (ADC); incremental ADC; triple-mode; SAR-based zooming; extended counting; pipeline operation
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Funding
- Ministry of Trade, Industry and Energy, Republic of Korea, through the Technology Innovation Program (Development of Suspended Heterogeneous Nanostructure-Based Hazardous Gas Microsensor System) [10054548]
- Ministry of Science and ICT, through the 2018 R&D support project based on science and technology according to the regional demand (Development of IoT Sensors and Plant-Safety Platform Against Hazardous Substances) [REDE 2018 US 001]
- National Research Foundation of Korea, Ministry of Education, through the Basic Science Research Program [2016R1D1A1B03930404]
- National Research Foundation of Korea [2016R1D1A1B03930404] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This paper proposes a triple-mode discrete-time incremental analog-to-digital converter (IADC) employing successive approximation register (SAR)-based zooming and extended counting (EC) schemes to achieve programmable trade-off capability of resolution and power consumption in various smart sensor applications. It mainly consists of an incremental delta-sigma modulator and the proposed SAR-EC sub-ADC for alternate operation of the coarse SAR conversion and EC. They can be reconfigured to operate separately depending on the application requirements. The SAR-based zooming structure allows the IADC to have better linearity and resolution, and additional activation of the EC function gives the further resolution. During this reconfigurable conversion process, pipelined reusing operation of sub-blocks reduces the silicon area and the number of cycles for target resolutions. A prototype ADC is fabricated in a 180-nm CMOS process, and its triple-mode operation of high-resolution, medium-resolution, and low-power is experimentally verified to achieve 116.1-, 109.4-, and 73.3-dB dynamic ranges, consuming 1.60, 1.26, and 0.39 mW, respectively.
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