Design and implementation of a 2 μA temperature-compensated MEMS-based real-time clock with ±4 ppm timekeeping accuracy

Jakub Gronicz; Mika Pulkkinen; Mikail Yucetas; Kari Halonen

doi:10.1016/j.mejo.2017.02.002

Design and implementation of a 2 μA temperature-compensated MEMS-based real-time clock with ±4 ppm timekeeping accuracy

Jakub Gronicz^*, Mika Pulkkinen, Mikail Yucetas, Kari Halonen

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

Abstract

This paper presents the design and measurements of a temperature-compensated real-time clock based on a silicon resonator. The system exhibits timekeeping accuracy of ±4 ppm over the −40 to 85 °C temperature range. The current implementation is based on a TIA-based oscillator with a 27 kHz MEMS resonator, a differential PTAT temperature sensor and a 2nd order ΣΔ ADC. The temperature compensation is performed by an on-chip DSP block. The system consumes 2 μA of current and operates at 1.8 V nominal supply. The resonator operates off a 1.2 V DC bias without the need for a charge-pump or providing an external higher DC voltage. The integrated electronics interface has been implemented using a standard 0.18 μm CMOS process.

Original language	English
Pages (from-to)	72-78
Number of pages	7
Journal	Microelectronics Journal
Volume	62
DOIs	https://doi.org/10.1016/j.mejo.2017.02.002
Publication status	Published - 1 Apr 2017
MoE publication type	A1 Journal article-refereed

Keywords

MEMS
Precision timing
Pulse skipping
RTC
Silicon resonator
Temperature compensation

Access to Document

10.1016/j.mejo.2017.02.002

Cite this

@article{d8b00b721eff467488a14674ef0c4c68,

title = "Design and implementation of a 2 μA temperature-compensated MEMS-based real-time clock with ±4 ppm timekeeping accuracy",

abstract = "This paper presents the design and measurements of a temperature-compensated real-time clock based on a silicon resonator. The system exhibits timekeeping accuracy of ±4 ppm over the −40 to 85 °C temperature range. The current implementation is based on a TIA-based oscillator with a 27 kHz MEMS resonator, a differential PTAT temperature sensor and a 2nd order ΣΔ ADC. The temperature compensation is performed by an on-chip DSP block. The system consumes 2 μA of current and operates at 1.8 V nominal supply. The resonator operates off a 1.2 V DC bias without the need for a charge-pump or providing an external higher DC voltage. The integrated electronics interface has been implemented using a standard 0.18 μm CMOS process.",

keywords = "MEMS, Precision timing, Pulse skipping, RTC, Silicon resonator, Temperature compensation",

author = "Jakub Gronicz and Mika Pulkkinen and Mikail Yucetas and Kari Halonen",

year = "2017",

month = apr,

day = "1",

doi = "10.1016/j.mejo.2017.02.002",

language = "English",

volume = "62",

pages = "72--78",

journal = "Microelectronics Journal",

issn = "0000-0000",

publisher = "Elsevier",

}

TY - JOUR

T1 - Design and implementation of a 2 μA temperature-compensated MEMS-based real-time clock with ±4 ppm timekeeping accuracy

AU - Gronicz, Jakub

AU - Pulkkinen, Mika

AU - Yucetas, Mikail

AU - Halonen, Kari

PY - 2017/4/1

Y1 - 2017/4/1

N2 - This paper presents the design and measurements of a temperature-compensated real-time clock based on a silicon resonator. The system exhibits timekeeping accuracy of ±4 ppm over the −40 to 85 °C temperature range. The current implementation is based on a TIA-based oscillator with a 27 kHz MEMS resonator, a differential PTAT temperature sensor and a 2nd order ΣΔ ADC. The temperature compensation is performed by an on-chip DSP block. The system consumes 2 μA of current and operates at 1.8 V nominal supply. The resonator operates off a 1.2 V DC bias without the need for a charge-pump or providing an external higher DC voltage. The integrated electronics interface has been implemented using a standard 0.18 μm CMOS process.

AB - This paper presents the design and measurements of a temperature-compensated real-time clock based on a silicon resonator. The system exhibits timekeeping accuracy of ±4 ppm over the −40 to 85 °C temperature range. The current implementation is based on a TIA-based oscillator with a 27 kHz MEMS resonator, a differential PTAT temperature sensor and a 2nd order ΣΔ ADC. The temperature compensation is performed by an on-chip DSP block. The system consumes 2 μA of current and operates at 1.8 V nominal supply. The resonator operates off a 1.2 V DC bias without the need for a charge-pump or providing an external higher DC voltage. The integrated electronics interface has been implemented using a standard 0.18 μm CMOS process.

KW - MEMS

KW - Precision timing

KW - Pulse skipping

KW - RTC

KW - Silicon resonator

KW - Temperature compensation

UR - http://www.scopus.com/inward/record.url?scp=85013843548&partnerID=8YFLogxK

U2 - 10.1016/j.mejo.2017.02.002

DO - 10.1016/j.mejo.2017.02.002

M3 - Article

AN - SCOPUS:85013843548

SN - 0000-0000

VL - 62

SP - 72

EP - 78

JO - Microelectronics Journal

JF - Microelectronics Journal

ER -

Design and implementation of a 2 μA temperature-compensated MEMS-based real-time clock with ±4 ppm timekeeping accuracy

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this