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. 2022 Apr 28;22(9):3396. doi: 10.3390/s22093396

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Operating flow of spur detection and reduction: (a) dividing the frequency by $f_{o}$ , (b) filtering and spur detection of $f_{1}$ , (c) reduction of $f_{1}$ and detection of $f_{2}$ , (d) reduction of $f_{2}$ and remove $f_{3}$ by off-chip filter.