-
公开(公告)号：US4776657A
公开(公告)日：1988-10-11
申请号：US844038
申请日：1986-03-25
申请人： Thomas M. Reeder
发明人： Thomas M. Reeder
摘要： An optical phase shifter comprises an optical waveguide of electro-optic material and an electrode structure associated with the waveguide for imposing an electrical field on the waveguide. The electrode structure comprises at least two groups of electrodes, each group having at least first and second electrodes between which the waveguide passes. The first electrode of one group and the second electrode of the other group are on opposite respective sides of the waveguide and are connected to respective input terminals for receiving an electrical signal. The second electrode of the one group is connected to the first electrode of the other group.
-
公开(公告)号：US4247903A
公开(公告)日：1981-01-27
申请号：US1628
申请日：1979-01-08
CPC分类号： G06G7/195
摘要： A monolithic surface acoustic wave (SAW) signal processor which combines the functions of acoustic wave interaction, nonlinear product mixing, and integration, together with rapid-scan readout capability, which may be used, for instance, in correlation of amplitude and/or phase coded signals of a duration order of magnitude larger than the total propagation delay time of the SAW device, includes launching transducers at opposite ends of an interaction region, and a plurality of interaction taps, each tap comprising a Schottky barrier field effect transistor (FET), the sources and drains of the FETs being connected in common, but each FET gate being isolated. For long code correlation of a phase shift keyed signal, a reference wave having the same carrier frequency and identical coding is launched contemporaneously therewith in a first, correlation step, a standing wave component of product mixing of the two waves being of like sign or sense at any tap where the two waves are properly in phase integrating over the total number of code chips of the waves to provide an integrated, stored charge manifestation of correlation on the isolated gate of the related tap, the taps being interrogated for an integrated indication of correlation at one of the taps by means of a pulse of width the same as the propagation delay of a single tap mixing with an extended carrier at each tap, a component of product mixing at a third frequency (sum or difference) as a consequence of enhanced mixer efficiency due to the stored charge at the correlating tap, providing an output indication of the fact of correlation and phase relationship between the two waves. Various surface acoustic wave transducer and tap structures, utilizations, and implementation techniques are discussed.
摘要翻译： 将声波相互作用，非线性乘积混合和积分的功能与快速扫描读出能力相结合的单片声表面波（SAW）信号处理器，例如可以用于幅度和/或相位的相关 持续时间数量级大于SAW器件的总传播延迟时间的编码信号包括在相互作用区域的相对端处发射换能器和多个相互作用抽头，每个抽头包括肖特基势垒场效应晶体管（FET） ，FET的源极和漏极共同连接，但每个FET栅极被隔离。 对于相移键控信号的长码相关，在第一相关步骤中同时启动具有相同载波频率和相同编码的参考波，两个波的产品混合的驻波分量具有相似的符号或意义 在任何分接头处，两个波在波的代码片的总数上正确地相位积分，以提供相关抽头的隔离栅上的相关的集成的存储的电荷表现，所述抽头被询问用于集成指示 通过与在每个抽头处的扩展载体混合的单个抽头的传播延迟相同的宽度脉冲，作为其中一个抽头的相关性，作为第三频率（总和或差）的产物混合的分量，作为 由于相关抽头存储的电荷，增强了混频器效率，提供了两个波之间的相关性和相位关系的事实的输出指示。 讨论了各种表面声波传感器和抽头结构，利用和实现技术。
-
公开(公告)号：US4207545A
公开(公告)日：1980-06-10
申请号：US936984
申请日：1978-08-25
摘要： Signals extracted from the taps of a surface acoustic wave (SAW) device, as a consequence of a single wave propogating therein or as a consequence of interaction between a pair of waves propagating therein, are processed by linearly-controlled nonlinear product mixing and/or amplifying devices, to provide output signals in a serial chain of chips of RF, the magnitude of chips being dependent upon unique, selected bias applied to corresponding ones of the devices. The devices may be diodes operating in a bias range to provide impedence greater than the capacitive reactance impedance of the taps to which they are attached, thereby providing a linear RF voltage to DC bias current characteristic, while at the same time providing a nonlinear DC voltage to DC current characteristic for RF product mixing (where used); or the devices may comprise transistors, either field effect or bipolar, with similar suitable bias considerations when linearly-controlled product mixing is desired. Applications, with or without output frequency isolation from input frequencies, include time division multiplexing of DC signals (such as transducer output signals), and transversal filtering, of the type useful in correlation or other wave or coded signal analysis.
摘要翻译： 从表面声波（SAW）装置的抽头中提取的信号由于在其中传播单波或由于在其中传播的一对波之间的相互作用而产生的结果，被线性控制的非线性产物混合和/或 放大器件，以在串联的RF芯片链中提供输出信号，芯片的幅度取决于应用于相应器件的唯一选择的偏置。 器件可以是在偏置范围内工作的二极管，以提供大于其所连接的抽头的容抗电阻的阻抗，从而提供直流偏压电流特性的线性RF电压，同时提供非线性直流电压 到RF产品混合的直流电流特性; 或者当需要线性控制的产品混合时，器件可以包括场效应或双极型晶体管，具有类似的合适的偏置考虑。 具有或不具有与输入频率的输出频率隔离的应用包括在相关或其它波或编码信号分析中有用的类型的DC信号（例如换能器输出信号）和横向滤波的时分复用。
-
公开(公告)号：US4085388A
公开(公告)日：1978-04-18
申请号：US725060
申请日：1976-09-21
CPC分类号： H03B5/326
摘要： A mode-locked surface acoustic wave oscillator (MLSO) provides mode-locked, phase coherent RF signal pulses through a regenerative closed loop RF signal path which includes a surface acoustic wave (SAW) delay line having a piezoelectric substrate and a pair of signal transducers relatively disposed at a determined SAW propagation distance along a major surface thereof, an RF amplifier to provide in phase amplification of the RF pulse, and a signal expander circuit for providing an increase in the harmonic frequencies of the RF signal pulse and an increased RF pulse frequency bandwidth. The pulse repetition frequency is determined by the signal propagation time delay, provided primarily by the SAW delay line. The delay line transducers establish the center frequency of the RF signal pulse and the bandwidth of the regenerative loop limits the minimum obtainable RF pulse width. An alternative embodiment of the MLSO includes a secondary loop which provides automatic generation of a synchronized trigger pulse having a pulse repetition frequency (PRF) derived from the RF signal pulse circulating in the regenerative loop. The synchronized trigger modulates the RF signal in the regenerative loop at a PRF equal to the reciprocal of the time delay of the SAW delay line, to further enhance the frequency mode-locked operation.
摘要翻译： 模式锁定表面声波振荡器（MLSO）通过再生闭环RF信号路径提供锁相相位相干RF信号脉冲，该再生闭环RF信号路径包括具有压电衬底和一对信号传感器的表面声波（SAW）延迟线 相对地设置在沿其主表面的确定的SAW传播距离处，RF放大器以提供RF脉冲的同相放大;以及信号扩展器电路，用于提供RF信号脉冲的谐波频率的增加和增加的RF脉冲 频率带宽。 脉冲重复频率由主要由SAW延迟线提供的信号传播时间延迟确定。 延迟线换能器建立RF信号脉冲的中心频率，并且再生回路的带宽限制可获得的最小RF脉冲宽度。 MLSO的替代实施例包括辅助回路，其提供自动生成具有从在再生回路中循环的RF信号脉冲导出的脉冲重复频率（PRF）的同步触发脉冲。 同步触发以等于SAW延迟线的时间延迟的倒数的PRF在再生环路中调制RF信号，以进一步增强频率锁定操作。
-
公开(公告)号：US4191933A
公开(公告)日：1980-03-04
申请号：US967322
申请日：1978-12-07
摘要： A surface acoustic wave signal processor having a plurality of taps, each connected to an external nonlinear device are arranged in pairs, each pair having its phase center aligned for interception of propagating waves at the same transversal distance from the launching thereof, the taps having configurations so that each tap in the pair receives signals at a phase which is inverted (180.degree. out of phase) with respect to corresponding signals received at the other tap of the pair, the product mixing output of the external nonlinear device for each tap being summed with the like output for the other tap in the pair, whereby all waves intercepted by the tap pair are cancelled at the product mixer outputs, along with certain of the components of product mixing having odd-ordered exponents. Disclosed configurations include tilted taps with co-propagating waves, longitudinally aligned taps with counter-propagating waves, and co-linear taps with plural channel, transversally displaced waves. Usage with internal mixing is also described.
摘要翻译： 具有多个抽头的表面声波信号处理器，每个连接到外部非线性装置成对地布置，每对具有相对中心对准，用于截取与其发射相同的横向距离处的传播波，该抽头具有构造 使得对中的每个抽头相对于在该对的另一个抽头处接收到的相应信号反相（相位相差180°）的相位接收信号，每个抽头的外部非线性装置的乘积混合输出相加 对于该对中的另一个抽头具有类似的输出，由此抽头对截获的所有波在产品混合器输出处被消除，以及具有奇数有序指数的产品混合的某些组件。 所公开的结构包括具有共同传播波的倾斜抽头，具有反向传播波的纵向排列的抽头以及具有多个通道的横向移位波的共线抽头。 还描述了内部混合的使用。
-
公开(公告)号：US4016514A
公开(公告)日：1977-04-05
申请号：US404831
申请日：1973-10-09
申请人： Thomas M. Reeder , Meyer Gilden
发明人： Thomas M. Reeder , Meyer Gilden
摘要： A nonlinear delay line correlator and convolver is described which comprises a tapped, piezoelectric surface acoustic wave delay line and an array of series or parallel connected forward biased semiconductor diodes. An interdigital signal transducer is connected to each end of the delay line and voltages are applied to each transducer to generate contra-flowing acoustic strain waves which are radiated toward an interaction region comprising a plurality of equi-spaced weakly coupled interdigital transducers, each transducer being connected to one diode. Nonlinear signal mixing in the diode array is utilized to perform serial product convolution or correlation of the signal modulation applied at the two signal input transducers. Because of the large nonlinearity of semiconductor diodes, insertion loss is relatively low. One feature of the diode correlator is a novel dual acoustic beam transducer which permits two separate acoustic beams to be generated without interaction therebetween except at the transducer taps.
摘要翻译： 描述了一种非线性延迟线相关器和卷积器，其包括抽头的压电表面声波延迟线和串联或并联的正向偏置半导体二极管的阵列。 叉指信号传感器连接到延迟线的每一端，并且电压被施加到每个换能器以产生反向流动的声应变波，其向包括多个等间隔的弱耦合的叉指换能器的相互作用区域辐射，每个换能器 连接到一个二极管。 利用二极管阵列中的非线性信号混合来执行在两个信号输入传感器处施加的信号调制的串行产品卷积或相关。 由于半导体二极管的非线性大，插入损耗相对较低。 二极管相关器的一个特征是新颖的双声束传感器，其允许在两者之间产生彼此之间的相互作用的两个分离的声束，除了在换能器抽头之外。
-
公开(公告)号：US4100811A
公开(公告)日：1978-07-18
申请号：US779106
申请日：1977-03-18
申请人： Donald E. Cullen , Thomas M. Reeder
发明人： Donald E. Cullen , Thomas M. Reeder
CPC分类号： G01L9/0025 , Y10S73/04
摘要： A diaphragm formed in a substrate and having a piezoelectric surface includes a first surface acoustic wave (SAW) delay line disposed on said surface and connected in an oscillator circuit for a significant frequency sensitivity to surface strain of said diaphragm, and a second, similar oscillator with the SAW delay line thereof connected for a significant frequency sensitivity to surface strain of the diaphragm opposite in sense to that of the first oscillator, and a mixer for providing the difference in the frequencies of the two oscillators, whereby the overall sensitivity to strain is enhanced, while at the same time the sensitivity to temperature variations is reduced significantly through subtractive combination.
摘要翻译： 形成在基板中并且具有压电表面的隔膜包括设置在所述表面上的第一表面声波（SAW）延迟线，并连接在振荡器电路中，以对所述隔膜的表面应变具有显着的频率灵敏度，以及第二类似的振荡器 其SAW延迟线被连接成对于与第一振荡器的表面应变相反的表面应变具有显着的频率灵敏度，以及用于提供两个振荡器的频率差的混合器，由此对应变的总体灵敏度为 增强，同时通过减法组合显着降低对温度变化的敏感性。
-
公开(公告)号：US3978731A
公开(公告)日：1976-09-07
申请号：US445193
申请日：1974-02-25
CPC分类号： G01L9/0025 , G10K11/36 , H03B5/326 , H03B5/04 , Y10S73/04
摘要： Surface acoustic waves are propagated across a thin, flexible diaphragm which is subjected to an applied external pressure. Since the wave velocity and path length vary with diaphragm deformation, the acoustic wave delay time is a function of the applied external pressure. Electroacoustic transducers are fabricated on opposite edges of the diaphragm for electronic excitation and detection of the surface acoustic wave. An electronic feedback path including the two transducers, the wave path, and an electronic amplifier oscillates at a frequency which is determined by the delay time required for acoustic wave propagation over the diaphragm path, and which decreases approximately linearly with applied external pressure. A second acoustic path called the reference path has a length equal to the first path and in the preferred embodiment contains a diaphragm which is subject to a different applied pressure. A second electronic feedback path composed of two transducers, the reference path and a second amplifier oscillates at a second frequency called the reference frequency. By applying a sample of the first and second oscillator voltages to a semiconductor mixer, a difference frequency output is obtained which is proportional to the differential pressure. The difference frequency output is approximately independent of temperature, and is easily converted to various digital codes by use of standard frequency counter circuits. If only one set of transducers is used, the device can also measure temperature in a digital manner. By adding a mass load to the center of the diaphragm, acceleration may be measured. Stress or strain measurements may also be made by bonding the diaphragms or only the transducers directly on the physical surface to be measured.
摘要翻译： 表面声波在穿过施加的外部压力的薄的柔性隔膜上传播。 由于波浪速度和路径长度随隔膜变形而变化，所以声波延迟时间是施加的外部压力的函数。 在隔膜的相对边缘上制造电声换能器，用于电子激发和检测表面声波。 包括两个换能器，波道和电子放大器的电子反馈路径以由隔膜路径上的声波传播所需的延迟时间确定的频率振荡，并且随着施加的外部压力而大致线性地减小。 称为基准路径的第二声路径具有等于第一路径的长度，并且在优选实施例中包含经受不同施加压力的隔膜。 由两个换能器组成的第二电子反馈路径，参考路径和第二放大器以称为参考频率的第二频率振荡。 通过将第一和第二振荡器电压的样本应用于半导体混频器，获得与压差成比例的差分频率输出。 差频输出大体上与温度无关，并且通过使用标准频率计数器电路容易地转换成各种数字代码。 如果仅使用一组换能器，则该装置还可以以数字方式测量温度。 通过向隔膜的中心添加质量负载，可以测量加速度。 压力或应变测量也可以通过将膜片或仅传感器直接粘合在待测物理表面上来进行。
-
公开(公告)号：US4663746A
公开(公告)日：1987-05-05
申请号：US637061
申请日：1984-08-02
摘要： Self-scanned piezoelectric delay line effective for time multiplexing system sampled physical parameters, subject to frequency mixing of the product signals from a clocked RF signal generator passing through a plurality of electrodes in the delay line, and the signals of voltage controlled oscillators driven by sensor detectors linked to the physical system.
摘要翻译： 自扫描的压电延迟线对于时间复用系统采样的物理参数有效，受到来自经过延迟线中的多个电极的定时RF信号发生器的产物信号的频率混合以及由传感器驱动的压控振荡器的信号 检测器与物理系统相连。
-
公开(公告)号：US4114116A
公开(公告)日：1978-09-12
申请号：US820474
申请日：1977-08-01
申请人： Thomas M. Reeder
发明人： Thomas M. Reeder
CPC分类号： H03H9/44 , G06G7/195 , H03H9/1455 , H03H9/72
摘要： A surface acoustic wave signal processor comprises a piezoelectric substrate having acoustoelectric transducers disposed thereon in discrete channels which run along the direction of propagation of the substrate, there being a plurality of acoustoelectric transducers in each channel which are connected to related ones in adjacent channels, and a transducer in each channel which is electrically independent from related ones in adjacent channels, thereby providing a plurality of ports, each port having a transducer in each of the channels, the transducers of at least one of the ports being electrically interconnected and those of at least one of the ports being electrically independent. A variety of configurations and utilizations are disclosed.
-
-
-
-
-
-
-
-
-
搜索结果
10 条记录 (耗时 0.014 秒)