Abstract
A kind of frequency tracking circuit based on phase-locked loop (PLL) is studied for the resonant infrared sensor in the paper. The operating principle of the PLL is analyzed. 74HC4046 as the core component of the circuit is selected; starting the lock circuit is researched; a closed-loop frequency tracking circuit based on 74HC4046 is built. Software simulation proves that the frequency tracking of the circuit can achieve the order of MHz and has good frequency stability and tracking performance, which lays a foundation for the construction of the follow-up resonant sensor excitation/detection circuit.
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