表面聲波延遲線放大器之相位模擬與分析

The Simulation and Analysis of Phase Perturbation Mechanism for Surface Acoustic Wave Delay-line Amplifier

蕭光佑(Kuang-You Hsiao)

指導教授 ： 鄭湘原

中原大學/工學院/電子工程研究所/碩士(2009年)

https://doi.org/10.6840/cycu200900628

摘要

表面聲波元件(Surface Acoustic Wave Device)因其具有高波速、高機電耦合係數、低傳輸損失和溫度穩定性高的優異特性，所以在通訊系統中，擔綱高頻濾波器的重要角色，是不可缺少的關鍵零組件。由於其特殊的材料特性與波傳機制，使得表面聲波元件也漸漸地應用在感測領域中，配合著不同的外部線路，可量測出溫度、濕度、壓力、位移、氣體解析…等物理訊號。
本論文針對表面聲波氣體感測器進行理論、模型建立、電路設計與相位變化之模擬分析。首先進行表面聲波元件理論的探討，包括材料的波傳特性、指叉電極的設計與感測機制等；接著進行振盪電路的分析設計與雙埠表面聲波元件的模型建立，再利用模擬軟體進行振盪電路的模擬，並模擬兩種不同中心頻率的元件，最後將模擬結果進行分析與驗證，並對結果作相關討論。
　　本研究已建立中心頻率433MHz之表面聲波元件等效模型，亦利用相移器(Phase-Shift)置入整體振盪電路中進行模擬，並由模擬結果得知，當表面聲波元件的操作頻率較高時，感測時具有較大之相位變化量與頻率漂移量，本研究之成果對未來相關感測技術提供了先期的驗證，期許有助於未來表面聲波感測器的持續開發。

關鍵字

表面聲波 ； 相位 ； 振盪器

並列摘要

SAW (Surface Acoustic Wave) device has excellent characteristics of high wave-velocity, high electrical coupling coefficient, low transmission loss and high temperature stability, and therefore SAW device plays an important role as a high frequency filter in communication system. It is also an indispensable component for that system. Due to the specific material characteristics and the wave proceeding mechanism of SAW device, it has been widely used in sensor application. Besides, it is capable of measuring of physical signals, temperature, humidity, pressure, distance and gases by different external circuits.
This thesis includes theory, model setup, circuit design and simulation on SAW gas sensor. First of all, it’s essential to establish SAW device analysis, including wave propagation and frequency response as well as design of electrode. And the oscillator circuit was designed and SAW device model was built. Moreover, simulation software is adopted for modeling the oscillator based on two different center frequencies. Finally the simulation result is discussed.
The 433MHz SAW model has been studied in the research, and the phase-shifter is used for the simulation in the oscillator for the first time. According to the simulation result, there are larger phase and frequency variation in the SAW devices with higher center frequency. The result provides the potential development and verification for related sensor technology witch is expected to be promising in the near future.

並列關鍵字

phase ； oscillator ； surface acoustic wave

參考文獻

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[1] J. David N. Cheeke, “Fundamentals and Applications of Ultrasonic Waves”, CRC Press, pp.59-74, 217-285, 2002