What is it about?
Frequency calibration refers to frequency correction of an oscillator's frequency which can change due to parameter variation. It is frequently employed in wireless sensor node design and should be of low power and small calibration time. This is done by sensing the "fraction" (basically the remainder) when the oscillator's frequency is divided by a reference frequency. Since the fraction is measured at the reference edges (which is at a lower frequency compared to the oscillator frequency), the power consumption is reduced. Also using "fractions" instead of "integers" provide faster calibration time. In this paper the algorithm is developed followed by system level design and finally verification through circuit design.
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Why is it important?
The work is important as it provides a low power technique to solve the problem of frequency calibration. It provides lower power consumption than the state-of-the-art. The low power comes from the fact that the fraction is sensed at the reference edges which is at a lower frequency compared to the oscillator's. There is no block which runs at the high frequency rate. This has not been achieved before.
Perspectives
The publication talks about a method to correct frequencies by consuming very low power and having fast calibration time. Wireless sensor nodes (WSNs) typically employ binary frequency shift keying as the modulation scheme. There frequency calibration is required to be carried out by consuming very low power. So the design fits perfectly in this scenario and the author feels that future WSN architectures will use the proposed design.
Dr. Amitava Ghosh
Sankalp Semiconductor Pvt. Ltd.
Read the Original
This page is a summary of: Fraction Phase based Low Energy Frequency Calibration (FPLEFC) : Analysis and Design , IET Circuits Devices & Systems, February 2017, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-cds.2015.0218.
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