title: A Low-Power All-Digital on-Chip CMOS Oscillator for a Wireless Sensor Node.
abstract: This paper presents an all-digital low-power oscillator for reference clocks in wireless body area network (WBAN) applications. The proposed on-chip complementary metal-oxide-semiconductor (CMOS) oscillator provides low-frequency clock signals with low power consumption, high delay resolution, and low circuit complexity. The cascade-stage structure of the proposed design simultaneously achieves high resolution and a wide frequency range. The proposed hysteresis delay cell further reduces the power consumption and hardware costs by 92.4% and 70.4%, respectively, relative to conventional designs. The proposed design is implemented in a standard performance 0.18 μm CMOS process. The measured operational frequency ranged from 7 to 155 MHz, and the power consumption was improved to 79.6 μW (@7 MHz) with a 4.6 ps resolution. The proposed design can be implemented in an all-digital manner, which is highly desirable for system-level integration.
authors.affiliation: Department of Electrical Engineering, Fu Jen Catholic University, Taipei 24205, Taiwan. duosheng@mail.fju.edu.tw.
authors.forename: Duo
authors.initials: D
authors.lastname: Sheng
authors.affiliation: Department of Electrical Engineering, Fu Jen Catholic University, Taipei 24205, Taiwan. bob_hong@princeton.com.tw.
authors.forename: Min-Rong
authors.initials: MR
authors.lastname: Hong
keywords: all digital; low power; on-chip reference clock generator; wireless body area network (WBAN); wireless sensor node