title: Normally Off ECG SoC With Non-Volatile MCU and Noise Tolerant Heartbeat Detector.
abstract: This paper describes an electrocardiograph (ECG) monitoring SoC using a non-volatile MCU (NVMCU) and a noise-tolerant instantaneous heartbeat detector. The novelty of this work is the combination of the non-volatile MCU for normally off computing and a noise-tolerant-QRS (heartbeat) detector to achieve both low-power and noise tolerance. To minimize the stand-by current of MCU, a non-volatile flip-flop and a 6T-4C NVRAM are used. Proposed plate-line charge-share and bit-line non-precharge techniques also contribute to mitigate the active power overhead of 6T-4C NVRAM. The proposed accurate heartbeat detector uses coarse-fine autocorrelation and a template matching technique. Accurate heartbeat detection also contributes system-level power reduction because the active ratio of ADC and digital block can be reduced using heartbeat prediction. Measurement results show that the fully integrated ECG-SoC consumes 6.14 μ A including 1.28- μA non-volatile MCU and 0.7- μA heartbeat detector.
authors.forename: Shintaro
authors.initials: S
authors.lastname: Izumi
authors.forename: Ken
authors.initials: K
authors.lastname: Yamashita
authors.forename: Masanao
authors.initials: M
authors.lastname: Nakano
authors.forename: Shusuke
authors.initials: S
authors.lastname: Yoshimoto
authors.forename: Tomoki
authors.initials: T
authors.lastname: Nakagawa
authors.forename: Yozaburo
authors.initials: Y
authors.lastname: Nakai
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kawaguchi
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Kimura
authors.forename: Kyoji
authors.initials: K
authors.lastname: Marumoto
authors.forename: Takaaki
authors.initials: T
authors.lastname: Fuchikami
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Fujimori
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nakajima
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Shiga
authors.forename: Masahiko
authors.initials: M
authors.lastname: Yoshimoto
mesh_terms: D000465:Algorithms; D001698:Biomedical Engineering / Q000295:instrumentation; D004562:Electrocardiography / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D012815:Signal Processing, Computer-Assisted; D017216:Telemedicine / Q000295:instrumentation* / Q000379:methods