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1. 发明申请

WO1997025776A1 HIGH FREQUENCY SAW DEVICE 审中-公开
标题翻译：高频SAW器件
公开(公告)号：WO1997025776A1
公开(公告)日：1997-07-17
申请号：PCT/US1996017906
申请日：1996-12-20
申请人： SAWTEK, INC. , NAUMENKO, Natalya F. , ORLOV, Victor S.
发明人： SAWTEK, INC.
IPC分类号： H03H09/17
CPC分类号： H03H9/02606 , H03H9/0259
摘要： A langasite crystal substrate having a prescribed range of Euler angles for substrate and crystal orientation improves signal processing for a surface acoustic wave (SAW) device, and thus for radiotelephones, mobile communication systems, television systems, and the like. When a voltage is applied to an input interdigital transducer IDT (2), a surface acoustic wave is generated in a piezoelectric substrate of langasite (1). This wave propagates in a direction generally perpendicular to electrodes of the IDT (2). The langasite crystal cut and wave propagation directions are defined which reduce insertion loss due to SAW transduction, diffraction, and beam steering. Temperature stability is improved. A low power flow angle and reduced level of diffraction is also achieved.
摘要翻译：具有用于衬底和晶体取向的欧拉角的规定范围的硅藻土晶体衬底改善了表面声波（SAW）器件的信号处理，并因此改善了无线电话，移动通信系统，电视系统等的信号处理。当电压被施加到输入叉指式换能器IDT（2）时，在朗氏体（1）的压电基板中产生表面声波。该波在大致垂直于IDT（2）的电极的方向上传播。定义了镧系晶体切割和波传播方向，其减少了由SAW传导，衍射和光束转向引起的插入损耗。温度稳定性提高。还实现了低功率流动角度和降低的衍射水平。

2. 发明申请

WO1997020191A1 TIME DOMAIN DELAY MEASUREMENT APPARATUS AND ASSOCIATED METHOD 审中-公开
标题翻译：时域延迟测量装置和相关方法
公开(公告)号：WO1997020191A1
公开(公告)日：1997-06-05
申请号：PCT/US1996018035
申请日：1996-11-14
申请人： SAWTEK, INC. , ANDERSEN, Jorgen, W.
发明人： SAWTEK, INC.
IPC分类号： G01H05/00
CPC分类号： G01P5/247 , G01H5/00
摘要： An embodiment of a sensing apparatus includes an ultrasonic delay sensor having a delay related to the sensed quantity; and a time domain analysis circuit for recirculating pulses through the ultrasonic delay sensor or device and for generating the output signal related to the sensed quantity. In particular, the time domain analysis circuit may include a pulse generator for generating a series of input pulses to the ultrasonic delay sensor; a pulse detector for detecting a series of output pulses after propagation through the ultrasonic delay sensor; and a pulse recirculating circuit for causing the pulse generator to generate the series of input pulses based upon respective previously detected output pulses from the pulse detector. The apparatus also preferably includes circuits for suppressing the undesirable reflections generated by the ultrasonic delay sensor. For example, random phase switching may be used for randomly switching phases of the series of input pulses to the ultrasonic delay sensor to thereby reduce undesired reflections. In addition, a fixed delay may be operatively connected between the pulse detector and the pulse generator. Also time diversity matching to the ultrasonic delay device may also be used to suppress the effects of undesired reflections. Method aspects of the invention are also disclosed.
摘要翻译：感测装置的实施例包括具有与感测量相关的延迟的超声波延迟传感器; 以及时域分析电路，用于使脉冲再循环通过超声波延迟传感器或装置，并用于产生与感测量有关的输出信号。特别地，时域分析电路可以包括用于产生到超声波延迟传感器的一系列输入脉冲的脉冲发生器; 脉冲检测器，用于在通过超声波延迟传感器传播之后检测一系列输出脉冲; 以及脉冲再循环电路，用于使得脉冲发生器基于来自脉冲检测器的相应的先前检测到的输出脉冲来产生一系列输入脉冲。该装置还优选地包括用于抑制由超声波延迟传感器产生的不希望的反射的电路。例如，随机相位切换可以用于将一系列输入脉冲的相位随机切换到超声波延迟传感器，从而减少不期望的反射。此外，固定延迟可以可操作地连接在脉冲检测器和脉冲发生器之间。此外，还可以使用与超声波延迟装置的时间分集匹配来抑制不期望的反射的影响。还公开了本发明的方法方面。

3. 发明申请

WO1997010646A1 WEIGHTED TAPERED SPUDT SAW DEVICE 审中-公开
标题翻译：称重的锥形扫描器件
公开(公告)号：WO1997010646A1
公开(公告)日：1997-03-20
申请号：PCT/US1995016528
申请日：1995-12-18
申请人： SAWTEK, INC.
发明人： SAWTEK, INC. , SOLIE, Leland, P.
IPC分类号： H03H09/145
CPC分类号： H03H9/14558 , H03H9/02842 , H03H9/14505 , H03H9/14517 , H03H9/14547 , H03H9/14552
摘要： A tapered surface acoustic wave SPUDT transducer useful in providing an improved insertion loss and triple transit suppression signal for a wideband SAW filter comprises a pair of interdigitized opposing electrodes each having a plurality of interdigitized fingers. Within each acoustic wavelength the widths of the electrodes and/or the gaps between electrodes are not all equal. This is a consequence of satisfying the conventional SPUDT reflection requirements. The interdigitized electrode fingers of opposing electrodes in the transducer have a tapered alignment wherein a period of electrode finger portions along a longitudinal axis of acoustic wave propagation decreases along a transverse length of the fingers. Means are provided for applying an electrical load and/or source across the pair of electrode bus bars of each transducer.
摘要翻译：用于为宽带SAW滤波器提供改进的插入损耗和三重转接抑制信号的锥形表面声波SPUDT传感器包括一对交叉指向的相对电极，每个具有多个交叉指状的指状物。在每个声波长度内，电极的宽度和/或电极之间的间隙不是全部相等。这是满足常规SPUDT反射要求的结果。换能器中相对电极的交叉指状电极指具有锥形对准，其中沿着声波传播的纵向轴的电极指部分的周期沿着手指的横向长度减小。提供了用于在每个换能器的一对电极母线上施加电负载和/或源的装置。

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