A 32-kHz Real-Time Clock Oscillator with On-Chip PVT Variation Compensation Circuit for Ultra-Low Power MCUs
Summary :
This paper proposes an ultra-low power fully on-chip CMOS relaxation oscillator (ROSC) for a real-time clock application. The proposed ROSC employs a compensation circuit of a comparator's non-idealities caused by offset voltage and delay time. The ROSC can generate a stable, and 32-kHz oscillation clock frequency without increasing power dissipation by using a low reference voltage and employing a novel compensation architecture for comparators. Measurement results in a 0.18-μm CMOS process demonstrated that the circuit can generate a stable clock frequency of 32.55 kHz with low power dissipation of 472 nW at 1.8-V power supply. Measured line regulation and temperature coefficient were 1.1%/V and 120 ppm/°C, respectively.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E98-C No.5 pp.446-453
- Publication Date
- 2015/05/01
- Publicized
- Online ISSN
- 1745-1353
- DOI
- 10.1587/transele.E98.C.446
- Type of Manuscript
- PAPER
- Category
- Integrated Electronics
Authors
Keishi TSUBAKI
Kobe University
Tetsuya HIROSE
Kobe University
Nobutaka KUROKI
Kobe University
Masahiro NUMA
Kobe University
Keyword
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Keishi TSUBAKI, Tetsuya HIROSE, Nobutaka KUROKI, Masahiro NUMA, "A 32-kHz Real-Time Clock Oscillator with On-Chip PVT Variation Compensation Circuit for Ultra-Low Power MCUs" in IEICE TRANSACTIONS on Electronics,
vol. E98-C, no. 5, pp. 446-453, May 2015, doi: 10.1587/transele.E98.C.446.
Abstract: This paper proposes an ultra-low power fully on-chip CMOS relaxation oscillator (ROSC) for a real-time clock application. The proposed ROSC employs a compensation circuit of a comparator's non-idealities caused by offset voltage and delay time. The ROSC can generate a stable, and 32-kHz oscillation clock frequency without increasing power dissipation by using a low reference voltage and employing a novel compensation architecture for comparators. Measurement results in a 0.18-μm CMOS process demonstrated that the circuit can generate a stable clock frequency of 32.55 kHz with low power dissipation of 472 nW at 1.8-V power supply. Measured line regulation and temperature coefficient were 1.1%/V and 120 ppm/°C, respectively.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E98.C.446/_p
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@ARTICLE{e98-c_5_446,
author={Keishi TSUBAKI, Tetsuya HIROSE, Nobutaka KUROKI, Masahiro NUMA, },
journal={IEICE TRANSACTIONS on Electronics},
title={A 32-kHz Real-Time Clock Oscillator with On-Chip PVT Variation Compensation Circuit for Ultra-Low Power MCUs},
year={2015},
volume={E98-C},
number={5},
pages={446-453},
abstract={This paper proposes an ultra-low power fully on-chip CMOS relaxation oscillator (ROSC) for a real-time clock application. The proposed ROSC employs a compensation circuit of a comparator's non-idealities caused by offset voltage and delay time. The ROSC can generate a stable, and 32-kHz oscillation clock frequency without increasing power dissipation by using a low reference voltage and employing a novel compensation architecture for comparators. Measurement results in a 0.18-μm CMOS process demonstrated that the circuit can generate a stable clock frequency of 32.55 kHz with low power dissipation of 472 nW at 1.8-V power supply. Measured line regulation and temperature coefficient were 1.1%/V and 120 ppm/°C, respectively.},
keywords={},
doi={10.1587/transele.E98.C.446},
ISSN={1745-1353},
month={May},}
Copy
TY - JOUR
TI - A 32-kHz Real-Time Clock Oscillator with On-Chip PVT Variation Compensation Circuit for Ultra-Low Power MCUs
T2 - IEICE TRANSACTIONS on Electronics
SP - 446
EP - 453
AU - Keishi TSUBAKI
AU - Tetsuya HIROSE
AU - Nobutaka KUROKI
AU - Masahiro NUMA
PY - 2015
DO - 10.1587/transele.E98.C.446
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E98-C
IS - 5
JA - IEICE TRANSACTIONS on Electronics
Y1 - May 2015
AB - This paper proposes an ultra-low power fully on-chip CMOS relaxation oscillator (ROSC) for a real-time clock application. The proposed ROSC employs a compensation circuit of a comparator's non-idealities caused by offset voltage and delay time. The ROSC can generate a stable, and 32-kHz oscillation clock frequency without increasing power dissipation by using a low reference voltage and employing a novel compensation architecture for comparators. Measurement results in a 0.18-μm CMOS process demonstrated that the circuit can generate a stable clock frequency of 32.55 kHz with low power dissipation of 472 nW at 1.8-V power supply. Measured line regulation and temperature coefficient were 1.1%/V and 120 ppm/°C, respectively.
ER -
English
