A Fully On-Chip, 6.66-kHz, 320-nA, 56ppm/°C, CMOS Relaxation Oscillator with PVT Variation Compensation Circuit

Keishi TSUBAKI  Tetsuya HIROSE  Yuji OSAKI  Seiichiro SHIGA  Nobutaka KUROKI  Masahiro NUMA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.6   pp.512-518
Publication Date: 2014/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.512
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
ROSC,  RTC,  oscillator,  comparator,  PVT variation,  low-power,  

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Summary: 
A fully on-chip CMOS relaxation oscillator (ROSC) with a PVT variation compensation circuit is proposed in this paper. The circuit is based on a conventional ROSC and has a distinctive feature in the compensation circuit that compensates for comparator's non-idealities caused by not only offset voltage, but also delay time. Measurement results demonstrated that the circuit can generate a stable clock frequency of 6.66kHz. The current dissipation was 320nA at 1.0-V power supply. The measured line regulation and temperature coefficient were 0.98%/V and 56ppm/°C, respectively.