1.2 MHz relaxation oscillator with 16.8 ppm/°C temperature coefficient using resistive self-bias current

In this research, the authors propose a self-biased relaxation oscillator that outputs a constant 1.2 MHz clock over a wide temperature range. Excluding any external bias, the proposed oscillator embodies a self-bias circuit that generates a bias current from a precisely trimmed resistor. To minimis...

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Bibliographic Details
Published in:Electronics letters 2019-04, Vol.55 (8), p.442-444
Main Authors: Choi, J, Kim, J, Lee, Y, Chun, J.-H
Format: Article
Language:English
Subjects:
bias current
Circuits and systems
CMOS integrated circuits
comparators
comparators (circuits)
external bias
frequency 1.2 MHz
low‐power electronics
power 17.9 muW
precisely trimmed resistor
relaxation oscillator
relaxation oscillators
resistive self‐bias
resistors
self‐bias circuit
self‐biased relaxation oscillator
size 180.0 nm
switched‐bias technique
temperature coefficient
temperature ‐20.0 degC to 80.0 degC
voltage 1.5 V
wide temperature range
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Summary:In this research, the authors propose a self-biased relaxation oscillator that outputs a constant 1.2 MHz clock over a wide temperature range. Excluding any external bias, the proposed oscillator embodies a self-bias circuit that generates a bias current from a precisely trimmed resistor. To minimise the power consumption, a switched-bias technique was applied to the two comparators in the oscillator. The proposed circuit was fabricated in a 180 nm CMOS process. It consumes 17.9 µW from a 1.5 V supply, and its temperature coefficient is 16.8 ppm/°C in the range of −20–80°C.
ISSN:0013-5194
1350-911X
1350-911X
DOI:10.1049/el.2018.7821