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The Signal Processing of Quartz Resonator Based on Single Chip 1 1,* 1 2 Shaopeng Li , Wenjie Tian , Hongyun Zhou , and Qingjiang Zhao 1 Key Laboratory for Sensor, Beijing Information Science Technology University, Beijing, China happy-lsp@126.com, twjkm2008@163.com 2 Department of Physical Science and Technology, Kunming University, Kunming, Yunnan Province, China zqj00213@163.com Abstract. A signal processing scheme based on single chip has been propounded according to Single-Base Three-Electrode structure of the quartz resonator. The microcontroller as the central control unit counts the frequency signals of three electrodes step by step: measuring difference frequency signals among three electrodes and then send them to make sum and frequency multiplication. The output is measured by the display circuit. The results show that the signal extraction approach is simplified and it reduces the influence of interference factors related to output so as to improve the force sensitive property of resonator. Keywords: Single chip, quartz frequency measurement, resonator, force sensitive property. 1 Introduction Quartz crystal resonator, whose force-frequency effect and application have always been hot spots [1], has many advantages such as high stability and good repeatability in resonance frequency output. Aging and temperature can also change the resonator frequency besides str