《SAW time scaling techniques》.pdf

IEEETRANSACTIONSONSONICS AND ULTRASONICS,VOL. SU-28, NO. 4, JULY 1981 271 SAW Time Scaling Techniques HAGIT MESSER, MEMBER, IEEE, HAM GILBOA, MEMBER, IEEE, AND Y.BAR-NESS, SENIOR MEMBER,IEEE Abstract-Time scaling and timeinversion of analogsignals using sur- face acoustic waves (SAW)dispersive delay lines are described Experi- mental and computer simulation resultsare presented forseveral sys- tems. Optimal design maximizing thetime-bandwidth product of the input signal is discussed, and a comparison between the systems is made based on complexity, efficiency,and distortion of the outputsignal. 8 (1) Fig. 1. Block diagram of System A. 1. INTRODUCTION using a radio frequency (RF) detector after compression of IME REVERSAL and scaling of signals are very useful for the input waveform instead of the last multiplication. matching the datarate of the signals to the bandwidth of To demonstrate the operation of the system, let1-11 and 1-12 T a surface acoustic wave (SAW) convolver. Furthermore, the be the slopes of the SAW dispersive delay lines. The output of SAW convolver itself produces timescaling (speedup) by a the system is given by factor of two [ l ] . By slowing down the input signals by the same factor, areal time convolution of the input signals using the SAW convolver is obtained. The SAW convolver has a varietyof applications in com- municatio