Abstract
This paper presents an ultralow power (240 nA), wide voltage range (1.25–5.5 V), temperature-compensated RTC module achieving a typical accuracy of ±1 ppm at 1 Hz over the industrial temperature range of −40 to 85 °C. This is obtained by combining a miniature tuning fork 32 kHz XTALs with an ASIC in a miniature 8-pin ceramic package measuring only 3.2×1.5×0.8 mm3. An innovative patented all-digital interpolation scheme allows the accurate generation of a one pulse per second (1 PPS) signal with a resolution of 0.1 ppm permitting significant savings in terms of both the circuit area and power consumption (4×) compared to previously available such products.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsReferences
Ruffieux, D., et al.: Silicon resonator based 3.2μ W real time clock with ±10 ppm frequency accuracy. J. Solid-State Circuits. 45(1), 224–234 (2010)
Asl, S.Z., et al.: A 3 ppm 1.5 × 0.8 mm2 1.0 μA 32.768 kHz MEMS-based oscillator. J. Solid-State Circuits. 50(1), 1–12 (2015)
Ruffieux, D., et al.: A versatile timing microsystem based on wafer-level packaged XTAL/BAW resonators with sub-μW RTC mode and programmable HF clocks. J. Solid-State Circuits. 49(1), 212–222 (Jan. 2014)
Park, P., et al.: A thermistor-based temperature sensor for a real-time clock with ±2 ppm frequency stability. J. Solid-State Circuits. 50(7), 1571–1580 (2015)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer International Publishing AG
About this chapter
Cite this chapter
Ruffieux, D. et al. (2018). A 32 kHz DTCXO RTC Module with an Overall Accuracy of ±1 ppm and an All-Digital 0.1 ppm Compensation-Resolution Scheme. In: Harpe, P., Makinwa, K., Baschirotto, A. (eds) Hybrid ADCs, Smart Sensors for the IoT, and Sub-1V & Advanced Node Analog Circuit Design. Springer, Cham. https://doi.org/10.1007/978-3-319-61285-0_9
Download citation
DOI: https://doi.org/10.1007/978-3-319-61285-0_9
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-61284-3
Online ISBN: 978-3-319-61285-0
eBook Packages: EngineeringEngineering (R0)