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    • 5. 发明授权
    • PRF Stabilized surface acoustic wave oscillator
    • PRF稳定表面声波振荡器
    • US4325032A
    • 1982-04-13
    • US129438
    • 1980-03-11
    • Meyer Gilden
    • Meyer Gilden
    • H03B5/32H03L7/099H03L7/08H03L7/18
    • H03L7/099H03B5/326
    • Mode locked surface acoustic wave oscillators, configured as comb spectrum generators, are stabilized by means of a variable phase in the closed, oscillation loop, the phase being controlled in response to deviations of the low, pulse repetition frequency from a design reference PRF. The variable phase may be provided by a variable phase device inserted in the oscillatory loop, such as varactor-tuned lumped element delay lines or 90.degree. hybrids, or other devices. Or, the variable phase may be provided by a voltage tunable surface acoustic wave device used as the basic oscillator SAW delay line.
    • 配置为梳状频谱发生器的模式锁定表面声波振荡器通过闭合振荡环路中的可变相位稳定,该相位响应于来自设计参考PRF的低脉冲重复频率的偏差而被控制。 可变相位可以由插入到振荡环路中的可变相位装置提供,例如变容二极管调谐的集总元件延迟线或90°的混合电路或其他装置。 或者,可变相位可以由用作基本振荡器SAW延迟线的电压可调声表面波装置提供。
    • 7. 发明授权
    • Diode coupled tapped acoustic delay line correlator and convolver
    • 二极管耦合抽头声延迟线相关器和卷积器
    • US4016514A
    • 1977-04-05
    • US404831
    • 1973-10-09
    • Thomas M. ReederMeyer Gilden
    • Thomas M. ReederMeyer Gilden
    • G06G7/195H03H9/42H03H9/26G06G7/19H01L9/04H03H9/30
    • G06G7/195H03H9/42
    • 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.
    • 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。
    • 10. 发明授权
    • Mode-locked, surface acoustic wave oscillator
    • 锁模式,表面声波振荡器
    • US4085388A
    • 1978-04-18
    • US725060
    • 1976-09-21
    • Meyer GildenThomas M. ReederAnthony J. DeMaria
    • Meyer GildenThomas M. ReederAnthony J. DeMaria
    • H03B5/32H03B5/30
    • H03B5/326
    • 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.
    • 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。