A 1.2V 83dB DR single-ended input SC sigma modulator including a large-swing analog buffer for portable ECG applications
- Authors
- Duan, Quanzhen; Jung, Youngjae; Choi, Danbi; Roh, Jeongjin; Kim, Jongpal
- Issue Date
- Dec-2016
- Publisher
- WILEY
- Keywords
- electrocardiogram; low-power consumption; analog buffer; single-end input; sigma modulator
- Citation
- INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, v.44, no.12, pp.2164 - 2173
- Indexed
- SCIE
SCOPUS
- Journal Title
- INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
- Volume
- 44
- Number
- 12
- Start Page
- 2164
- End Page
- 2173
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/12177
- DOI
- 10.1002/cta.2219
- ISSN
- 0098-9886
- Abstract
- This study proposes a subsystem consisting of an analog buffer and a single-ended input to a fully differential sigma modulator to obtain low-power consumption for portable electrocardiogram applications. With the proposed subsystem, the need for an inverting amplifier is avoided, and low-power consumption is achieved. The sigma modulator with a second order, 1bit, and cascade of integrators feedforward structure consumes a low power, in which an inverting and a non-inverting path implement a single-ended input to fully-differential signals. A double sampling technique is proposed for a digital-to-analog converter feedback circuit to reduce the effect of the reference voltage, reduce the amplifier requirements, and obtain low-power consumption. Input-bias and output-bias transistors working in the weak-inversion region are implemented to obtain an extremely large swing for the analog buffer. At a supply voltage of 1.2V, signal bandwidth of 250Hz, and sampling frequency of 128kHz, the measurement results show that the modulator with a buffer achieves a 77dB peak signal-to-noise-distortion ratio, an effective-number-of-bits of 12.5 bits, an 83dB dynamic range, and a figure-of-merit of 156dB. The total chip size is approximately 0.28mm(2) with a standard 0.13 mu m Complementary Metal-Oxide-Silicon (CMOS) process. Copyright (c) 2016 John Wiley & Sons, Ltd.
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