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A 0.4 v 6.4 μw 3.3 MHz CMOS Bootstrapped Relaxation Oscillator with ±0.71% Frequency Deviation over -30 to 100 °c for Wearable and Sensing Applications
Lei K.-M.3; Mak P.-I.3; Martins R.P.3
2018-04-26
Source PublicationProceedings - IEEE International Symposium on Circuits and Systems
Volume2018-May
AbstractWearable and sensing electronics are evolving towards energy harvesting from the environment (e.g. thermal and solar energy). Ultra-low-voltage (ULV) circuits that allow direct-powering by sub-0.5 V energy sources can maximize the power efficiency. This work is a 0.4 V 65 nm CMOS relaxation oscillator with bootstrapped logic gates and outputs. The bootstrapped logic gates enable an output swing of 1.15 V surmounting the adverse effect of ULV digital circuits without extra voltage source. The ULV comparator with bulk-driven-inputs shows an 18 dB gain with 3 cascaded stages. Also, featuring a background delay-time cancellation scheme, the 3.3 MHz relaxation oscillator with built-in calibration exhibits a frequency deviation of ±0.71% and ±0.57% against temperature (-30 to 100 °C) and voltage (0.36 to 0.44 V) variations, respectively, from Monte-Carlo simulations (N=30). The simulated power consumption is 6.4 μW, resulting in an energy efficiency of 1.9 pJ per cycle.
Keywordbootstrap bulk-driven amplifier CMOS relaxation oscillator (RxO) ultra-low-voltage (ULV) wearable devices
DOI10.1109/ISCAS.2018.8351650
URLView the original
Language英語
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Document TypeConference paper
CollectionINSTITUTE OF MICROELECTRONICS
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Affiliation1.Harvard University
2.Instituto Superior Técnico
3.Universidade de Macau
Recommended Citation
GB/T 7714
Lei K.-M.,Mak P.-I.,Martins R.P.. A 0.4 v 6.4 μw 3.3 MHz CMOS Bootstrapped Relaxation Oscillator with ±0.71% Frequency Deviation over -30 to 100 °c for Wearable and Sensing Applications[C],2018.
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