SAW （Surface Acoustic Wave） filter bank is a single input, single or multi-output device consisting of multi-SAW-filters with input interconnection network or switch circuits, and can be divided into two categories...SAW （Surface Acoustic Wave） filter bank is a single input, single or multi-output device consisting of multi-SAW-filters with input interconnection network or switch circuits, and can be divided into two categories： channelizer （multi-output） and switchable （programmable, single output）. The tbrmer is mainly used in military channelized receiver for spectrum analysis; the latter has wide application in frequency synthesizer and frequency-hopping radar and communication system receiver as anti-jamming filter, and has been widely used in various military electronic equipments ever since the 1970s. Research abroad was done mainly by Americans, few documents on related work done by Japan and Russia are available. Domestic research started in the 1980s, mainly by No. 26 Research Institute, China Electronics Technology Group Co., Institute of Acoustics, Chinese Academy of Sciences, No. 23 and No. 25 Research Institute, China Spaceflight Tech. Group Co. This paper first briefly introduces Chinese and foreign research on SAW filter banks; then discusses research progress in device design, the input interconnection network or switch circuit and miniaturization; and ends in a brief perspective of developing trends in future.展开更多
Diamond surface acoustic wave(SAW) has been used to boost the frequency of thin film filters made of piezoelectric materials.Many designs have been tested and with significant results,in particular,AlN on diamond(AlNo...Diamond surface acoustic wave(SAW) has been used to boost the frequency of thin film filters made of piezoelectric materials.Many designs have been tested and with significant results,in particular,AlN on diamond(AlNoD) as the interface for transmitting Rayleigh wave was studied extensively .However,in all cases,nano crystalline or microcrystalline AlN coatings were deposited,typically by sputtering or CVD,on polycrystalline diamond film.The diamond film itself may contain nano or micro grains that are deposited by CVD.The presence of extensive grain boundaries in AlN can attenuate rapidly the propagation of Rayleigh wave.Moreover,the bonding between loose atomic packing of AlN and tight lattice of diamond is weak so much of the mechanical energy is dissipated as heat.In fact,the energy loss is much higher than energy transmitted during the resonating process.In this research,we attempted to improve the matching of atoms at the interface of AlNoD by doping AlN lattice with boron atoms.The shrinking of the lattice may allow more atoms are aligned at the interface.Moreover,a method of coupling single crystal AlN on single crystal diamond is proposed.Such a coupling can maximize the signal-to-noise ratio of the resonating AlNoD at the same time minimize the insertion loss of the SAW filter.展开更多
IDT公司推出其FemtoClocks^TM系列最新产品——新一代FemtoNG（FemtoClock Next Generation）。新一代的时钟合成器具有极低的相位噪声性能和显着改善的电源噪声抑制特性，当与串行接口配合使用时可实现更高的带宽。全新FemtoNG系列是...IDT公司推出其FemtoClocks^TM系列最新产品——新一代FemtoNG（FemtoClock Next Generation）。新一代的时钟合成器具有极低的相位噪声性能和显着改善的电源噪声抑制特性，当与串行接口配合使用时可实现更高的带宽。全新FemtoNG系列是完全可定制的独立解决方案，为高性能应用提供参考时钟，以取代客户之前常用的晶振和SAW振荡器。展开更多
文摘SAW （Surface Acoustic Wave） filter bank is a single input, single or multi-output device consisting of multi-SAW-filters with input interconnection network or switch circuits, and can be divided into two categories： channelizer （multi-output） and switchable （programmable, single output）. The tbrmer is mainly used in military channelized receiver for spectrum analysis; the latter has wide application in frequency synthesizer and frequency-hopping radar and communication system receiver as anti-jamming filter, and has been widely used in various military electronic equipments ever since the 1970s. Research abroad was done mainly by Americans, few documents on related work done by Japan and Russia are available. Domestic research started in the 1980s, mainly by No. 26 Research Institute, China Electronics Technology Group Co., Institute of Acoustics, Chinese Academy of Sciences, No. 23 and No. 25 Research Institute, China Spaceflight Tech. Group Co. This paper first briefly introduces Chinese and foreign research on SAW filter banks; then discusses research progress in device design, the input interconnection network or switch circuit and miniaturization; and ends in a brief perspective of developing trends in future.
文摘Diamond surface acoustic wave(SAW) has been used to boost the frequency of thin film filters made of piezoelectric materials.Many designs have been tested and with significant results,in particular,AlN on diamond(AlNoD) as the interface for transmitting Rayleigh wave was studied extensively .However,in all cases,nano crystalline or microcrystalline AlN coatings were deposited,typically by sputtering or CVD,on polycrystalline diamond film.The diamond film itself may contain nano or micro grains that are deposited by CVD.The presence of extensive grain boundaries in AlN can attenuate rapidly the propagation of Rayleigh wave.Moreover,the bonding between loose atomic packing of AlN and tight lattice of diamond is weak so much of the mechanical energy is dissipated as heat.In fact,the energy loss is much higher than energy transmitted during the resonating process.In this research,we attempted to improve the matching of atoms at the interface of AlNoD by doping AlN lattice with boron atoms.The shrinking of the lattice may allow more atoms are aligned at the interface.Moreover,a method of coupling single crystal AlN on single crystal diamond is proposed.Such a coupling can maximize the signal-to-noise ratio of the resonating AlNoD at the same time minimize the insertion loss of the SAW filter.
文摘IDT公司推出其FemtoClocks^TM系列最新产品——新一代FemtoNG（FemtoClock Next Generation）。新一代的时钟合成器具有极低的相位噪声性能和显着改善的电源噪声抑制特性，当与串行接口配合使用时可实现更高的带宽。全新FemtoNG系列是完全可定制的独立解决方案，为高性能应用提供参考时钟，以取代客户之前常用的晶振和SAW振荡器。
