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本文提出一种在声表面波器件中抑制三次行程信号的新措施。采用合理选择发射和接收叉指换能器之间距离的办法,使接收叉指换能器再生反射声波的相位与发射叉指换能器发射的声波在声同步频率上相位相反,而达到部分减小三次行程信号带来的影响,导出了实现这种抑制的方程式分析了此方法的适用范围,它只适合于幅度频率特性的通带呈“U”形的表面波滤波器和延迟线减小三次行程信号帝来的幅度频率特性失真。只要发射和接收叉指换能器间隔足够小,可大大减小群时延特性和脉冲响应的失真。建议将式中的n取为8。
In this paper, a new measure to suppress the signal of three strokes in SAW devices is proposed. A reasonable choice of transmitting and receiving distance between the interdigital transducers means that the receiving interdigital transducer reproduces the reflected acoustic wave and the transmitting interdigital transducer transmit sound waves in the opposite phase of the acoustic synchronous frequency and reaches the part Reduce the impact of the signal of the three trip and derive the equation to achieve this inhibition analysis of the scope of application of this method, it is only suitable for the amplitude and frequency characteristics of the passband was “U” -type surface wave filter and delay line minus Small three trip signal emperor to the amplitude frequency characteristics of distortion. As long as the transmit and receive interdigital transducers are spaced sufficiently small, the group delay characteristics and the impulse response distortion can be greatly reduced. It is recommended that n in the formula be taken as 8.