Open AccessIntegrated relaxation oscillator with no comparator for energy harvesting
Author(s) -
Ma Yanzhao,
Wang Danghui,
Zhang Shengbing,
Fan Xiaoya
Publication year - 2017
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2017.1274
Subject(s) - comparator , relaxation oscillator , comparator applications , inverter , subthreshold conduction , cmos , electrical engineering , offset (computer science) , energy harvesting , ring oscillator , electronic engineering , voltage , vackář oscillator , power (physics) , physics , materials science , voltage controlled oscillator , transistor , computer science , engineering , quantum mechanics , programming language
A fully‐integrated 12 kHz relaxation oscillator for energy harvesting application is presented. The oscillator has no comparator and no reference voltage. A conventional comparator has been replaced by a pseudo‐inverter chain to avoid comparator offset effect. Moreover, inverter threshold variation has no impact on the frequency. The circuit has been designed with 0.18 µm standard CMOS process. The oscillator operates in subthreshold region and consumes an ultra‐low power of 120 nW. A temperature coefficient of 31 ppm/°C has been achieved over −40 to 90°C.