摘要
针对振荡器中声表面波器件存在的体声波干扰、电极反射及旁瓣过大问题,提出了一种新型声表面波振荡器系统的设计方案。该方案将多条耦合器用于分离体声波,分裂电极用于减弱电极反射问题,并采用了输入、输出换能器双加权的措施来降低旁瓣信号。通过对一个中心频率为50.8MHz声表面波振荡器的实现和测试,得到该新型声表面波振荡器系统的振荡频率为50.613 MHz,与系统的设计值误差仅为3.6‰,并且具有良好的周期性和稳定性。
In order to solve the bulk acoustic wave（ BAW） interference,the electrodes reflection and high side lobe in the acoustic surface wave（ SAW） device of SAW oscillator system,the novel SAW oscillator system is proposed. In this design scheme,the BAW is separated by the multi-strip coupler,and the electrodes reflection and the side lobe are suppressed by the split electrode and weighted input and output input interdigital transducers,separately. The realization and measurement results of the novel SAW oscillator system with center frequency at 50. 8 MHz conform that the frequency of the oscillator signal is 50. 613 MHz,and the frequency error between the actual measurement and theoretical design is only 3. 6‰. Furthermore,the SAW oscillator system has good periodicity and stability.
出处
《电子器件》
CAS
北大核心
2014年第2期240-244,共5页
Chinese Journal of Electron Devices
基金
国家自然科学基金项目(60806043)
中央高校基本科研业务费专项资金项目(2013G3322010)
关键词
声表面波器件
声表面波振荡器
体声波
电极反射
旁瓣
surface acoustic wave（SAW） device
SAW oscillator
bulk acoustic wave（BAW）
electrodes reflection
side lobe
