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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
IEICE TRANSACTIONS on Electronics
Publication Date: 2014/06/01
Online ISSN: 1745-1353
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
ROSC, RTC, oscillator, comparator, PVT variation, low-power,
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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.