http://en.wikipedia.org/wiki/Surface_acoustic_wave Electronic devices employing SAWs normally use one or more interdigital transducers (IDTs) to convert acoustic waves to electrical signals and vice versa by exploiting the piezoelectric effect of certain materials (quartz, lithium niobate, lithium tantalate, lanthanum gallium silicate, etc.) These devices are fabricated by photolithography, the process used in the manufacture of silicon integrated circuits. SAW filters are now used in mobile telephones, and provide significant advantages in performance, cost, and size over other filter technologies such as quartz crystals (based on bulk waves), LC filters, and waveguide filters. Much research has been done in the last 20 years in the area of surface acoustic wave sensors.[3] Sensor applications include all areas of sensing (such as chemical, optical, thermal, pressure, acceleration, torque and biological). SAW sensors have seen relatively modest commercial success to date, but are commonly commercially available for some applications such as touchscreen displays.
2 則留言:
表面聲波 一般用在電子元件
http://zh.wikipedia.org/wiki/%E7%94%B5%E5%AD%90%E6%BB%A4%E6%B3%A2%E5%99%A8
表面聲波濾波器
表面聲波濾波器是經常用於無線電頻率應用的機電設備，電子信號在壓電晶體中轉化為機械波；這個波在通過晶體傳播時發生延時；後面的電極將它轉換成電信號。延時的輸出信號組合在一起成為有限脈衝響應濾波器的一個直接的模擬實現。這種混合濾波技術也見於模擬採樣濾波器中。
http://en.wikipedia.org/wiki/Surface_acoustic_wave
Electronic devices employing SAWs normally use one or more interdigital transducers (IDTs) to convert acoustic waves to electrical signals and vice versa by exploiting the piezoelectric effect of certain materials (quartz, lithium niobate, lithium tantalate, lanthanum gallium silicate, etc.) These devices are fabricated by photolithography, the process used in the manufacture of silicon integrated circuits.
SAW filters are now used in mobile telephones, and provide significant advantages in performance, cost, and size over other filter technologies such as quartz crystals (based on bulk waves), LC filters, and waveguide filters.
Much research has been done in the last 20 years in the area of surface acoustic wave sensors.[3] Sensor applications include all areas of sensing (such as chemical, optical, thermal, pressure, acceleration, torque and biological). SAW sensors have seen relatively modest commercial success to date, but are commonly commercially available for some applications such as touchscreen displays.
張貼留言