Lookup NU author(s): Dr Reza Ramezani,
Professor Alex Yakovlev,
Dr Fei Xia,
Dr Julian Murphy,
Dr Delong Shang
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In future systems with relatively unreliable and unpredictable energy sources such as harvesters, the system power supply may become non-deterministic. For energy effective operations, Vdd is an important parameter in any meaningful system control mechanism. Reliable and accurate on-chip voltage sensors are therefore indispensible for the power and computation management of such systems. Existing voltage sensing methods are not suitable because they usually require a stable and known reference (voltage, current, time, frequency, etc.), which is difficult to obtain in this environment. This paper describes an autonomous reference-free voltage sensor designed using an asynchronous counter powered by the charge on a capacitor and a small controller. Unlike existing methods, the voltage information is directly generated as a digital code. The sensor, fabricated in the 180 nm technology node, was tested successfully through performing measurements over the voltage range from 1.8 V down to 0.8 V.
Author(s): Ramezani R, Yakovlev A, Xia F, Murphy J, Shang D
Publication type: Article
Publication status: Published
Journal: IEEE Journal on Emerging and Selected Topics in Circuits and Systems (JETCAS)
Print publication date: 07/03/2013
ISSN (print): 2156-3357
ISSN (electronic): 2156-3365
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