Design of a CMOS Heartbeat Spike-Pulse Detection Circuit Integrable in an RFID Tag for Heart Rate Signal Sensing

Toshitaka YAMAKAWA  Takahiro INOUE  Masayuki HARADA  Akio TSUNEDA  

IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.6   pp.1336-1343
Publication Date: 2007/06/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.6.1336
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
RFID,  CMOS,  heartbeat,  switched capacitor,  

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A circuit design of a CMOS integrable heartbeat spike-pulse detection circuit is proposed in this paper. This circuit is developed to be implemented on a small-sized RFID sensor tag (which we call a smart RFID tag throughout this paper) implanted in a transgenic mouse. This circuit can detect only spike pulses with magnitude higher than the prescribed level from a mouse's heartbeat signal, which is sensed by a small microphone sensor and/or an electrocardiogram (ECG) microsensor attached to the RFID tag. The proposed circuit features robustness to the device tolerances and temperature variations thanks to its auto-bias technique based on good device matching and its switched-capacitor auto offset-canceling technique. The circuit was fabricated by a standard 0.35 µm CMOS process and works at a supply voltage of 3 V and dissipates less than 800 µW.