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Article

A 0.5 V Sub-Threshold CMOS Current-Controlled Ring Oscillator for IoT and Implantable Devices

1
Dipartimento di Ingegneria Elettrica Elettronica e Informatica (DIEEI), University of Catania, 95125 Catania, Italy
2
Dipartimento di Ingegneria dell’Informazione Elettronica e Telecomunicazioni (DIET), Sapienza University of Rome, 00184 Rome, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Orazio Aiello
J. Low Power Electron. Appl. 2022, 12(1), 16; https://doi.org/10.3390/jlpea12010016
Received: 8 February 2022 / Revised: 24 February 2022 / Accepted: 3 March 2022 / Published: 9 March 2022
(This article belongs to the Special Issue Ultra-Low-Power ICs for the Internet of Things)
A current-controlled CMOS ring oscillator topology, which exploits the bulk voltages of the inverter stages as control terminals to tune the oscillation frequency, is proposed and analyzed. The solution can be adopted in sub-1 V applications, as it exploits MOSFETS in the subthreshold regime. Oscillators made up of 3, 5, and 7 stages designed in a standard 28-nm technology and supplied by 0.5 V, were simulated. By exploiting a programmable capacitor array, it allows a very large range of oscillation frequencies to be set, from 1 MHz to about 1 GHz, with a limited current consumption. Considering, for example, the five-stage topology, a nominal oscillation frequency of 516 MHz is obtained with an average power dissipation of about 29 µW. The solution provides a tuneable oscillation frequency, which can be adjusted from 360 to 640 MHz by controlling the bias current with a sensitivity of 0.43 MHz/nA. View Full-Text
Keywords: ring oscillator; body biasing; tuning range ring oscillator; body biasing; tuning range
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MDPI and ACS Style

Ballo, A.; Pennisi, S.; Scotti, G.; Venezia, C. A 0.5 V Sub-Threshold CMOS Current-Controlled Ring Oscillator for IoT and Implantable Devices. J. Low Power Electron. Appl. 2022, 12, 16. https://doi.org/10.3390/jlpea12010016

AMA Style

Ballo A, Pennisi S, Scotti G, Venezia C. A 0.5 V Sub-Threshold CMOS Current-Controlled Ring Oscillator for IoT and Implantable Devices. Journal of Low Power Electronics and Applications. 2022; 12(1):16. https://doi.org/10.3390/jlpea12010016

Chicago/Turabian Style

Ballo, Andrea, Salvatore Pennisi, Giuseppe Scotti, and Chiara Venezia. 2022. "A 0.5 V Sub-Threshold CMOS Current-Controlled Ring Oscillator for IoT and Implantable Devices" Journal of Low Power Electronics and Applications 12, no. 1: 16. https://doi.org/10.3390/jlpea12010016

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