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A 0.35-V 5,200-μm 2 2.1-MHz Temperature-Resilient Relaxation Oscillator With 667 fJ/Cycle Energy Efficiency Using an Asymmetric Swing-Boosted RC Network and a Dual-Path Comparator.
- Source :
- IEEE Journal of Solid-State Circuits; Sep2021, Vol. 56 Issue 9, p2701-2710, 10p
- Publication Year :
- 2021
-
Abstract
- This article describes a 2.1-MHz relaxation oscillator (RxO) for energy-harvesting Internet-of-Things (IoT) sensor nodes. The RxO features an asymmetric swing-boosted RC network and a dual-path comparator to surmount the challenges of sub-0.5-V operation while achieving temperature resilience. The former enables alternating the common-mode voltages at the output of the RC network to facilitate the sub-0.5-V operation, while the latter is outfitted with a delay generator for tracking the temperature-sensitive delay of the comparator. Prototyped in 28-nm CMOS, the RxO occupies a tiny footprint of 5,200 μm<superscript>2</superscript>. The power consumption is 1.4 μW at 0.35 V. The measured temperature stability is 158 ppm/°C (average of seven chips) over −20 °C–120 °C. It scores the best energy efficiency (667 fJ/cycle) among the reported MHz-range RxOs and has a figure-of-merit (181 dB) that compares favorably with the state-of-the-art. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189200
- Volume :
- 56
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- IEEE Journal of Solid-State Circuits
- Publication Type :
- Academic Journal
- Accession number :
- 153244538
- Full Text :
- https://doi.org/10.1109/JSSC.2021.3067051