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An Ultra-Low-Power 16-Bit Second-Order Incremental ADC With SAR-Based Integrator for IoT Sensor Applications

Title
An Ultra-Low-Power 16-Bit Second-Order Incremental ADC With SAR-Based Integrator for IoT Sensor Applications
Author
권오경
Keywords
Analog-to-digital converter (ADC); delta sigma (Delta Sigma) ADC; successive approximation register (SAR); zero-crossing detector (ZCD); incremental ADC (IADC)
Issue Date
2018-12
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, v. 65, no. 12, page. 1899-1903
Abstract
This brief presents a 16-bit amplifier-free second-order incremental analog-to-digital converter (IADC2) for sensor applications. The proposed IADC2 employs a power efficient successive approximation register (SAR)-based integrator for the charge transfer operation, which consumes dynamic power only, instead of using power-consuming operational transconductance amplifiers that consume a high static current. The proposed amplifier thus achieves ultra-low-power consumption in low-frequency operation. In addition, the charge redistribution period of a capacitor digital-to-analog converter (CDAC) in the SAR-based integrator is split in a time-interleaving way, such that the CDAC can be shared by the first and second integrators. A test chip, including the proposed IADC2, was fabricated using 0.18-mu m standard CMOS process technology. The measurement results show that the proposed IADC2 achieves a differential nonlinearity of -0.51/+0.74 LSB and an integral nonlinearity of -3.12/+0.24 LSB. In addition, the measured maximum signal-to-noise ratio, and an effective number of bits are 93.4 dB and 15.22-bit for the dc signal, respectively. The measured power consumption is 0.24 mu W at a sampling frequency of 10 kHz. Therefore, the proposed IADC2 is suitable for various sensor applications requiring ultra-low-power consumption.
URI
https://ieeexplore.ieee.org/document/8329978http://repository.hanyang.ac.kr/handle/20.500.11754/121076
ISSN
1549-7747; 1558-3791
DOI
10.1109/TCSII.2018.2822299
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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