High-performance combined ring oscillators
ISSN: 0332-1649
Article publication date: 16 April 2020
Issue publication date: 18 June 2020
Abstract
Purpose
The purpose of this paper is to investigate a more robust ring oscillator. Less sensitivity to power supply variations is a target. This is important since low-quality ring oscillators could be exploited in numerous systems to reduce die costs.
Design/methodology/approach
The method in this work is large signal analysis. Delay time as the large signal parameter is calculated symbolically to explore dependency on a power supply voltage. Then simulations are performed to make a comparison. In this work, mathematical justifications are verified via HSPICE circuit simulator outputs, while 0.18 µm TSMC CMOS technology is exploited.
Findings
At least two combined configurations are presented with higher robustness. These circuits are more appropriate in noisy conditions. Both theoretical calculations and simulation results verify less sensitive oscillation against supply voltage ripples and temperature variations.
Originality/value
Introducing a band-switched inverter in combined configurations is contribution. In this way, three structures are presented which both show higher stability in oscillation frequency. The band switched delay time calculations are quite new and also the validity of the symbolical delay time approach is verified by circuit simulations.
Keywords
Citation
Soltani, M., Khatib, F. and Seyyed Mahdavi Chabok, S.J. (2020), "High-performance combined ring oscillators", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 39 No. 3, pp. 535-550. https://doi.org/10.1108/COMPEL-01-2020-0039
Publisher
:Emerald Publishing Limited
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