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. 2018 Oct 10;9(10):511. doi: 10.3390/mi9100511

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© 2018 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 (http://creativecommons.org/licenses/by/4.0/).

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Wide temperature range test curves: (a) The variation of frequency tuning voltage, (b) The variations of $V_{t_r e a l} - V_{t_t e s t}$ and $Δ f_{ν t}$ .