Title :
Broadband SAW-convolver, using dispersive IDTs with capacitive weighting
Author :
Boritko, S.V. ; Grigorievskii, V.I. ; Kmita, A.M.
Author_Institution :
Inst. of Radio Eng. & Electron., Acad. of Sci., Moscow, Russia
Abstract :
The problem of development of SAW convolvers with a wide relative passband and linear phase is decided by use of IDTs with capacitive weighting. A degenerate convolver with central frequency 95 MHz, relative passband of 36% and time of integration 20 μs was investigated. Dispersive IDTs with capacitive weighting for excitation of SAW were used. Uniform distribution of acoustic energy under the aperture of an acoustic beam takes place in the convolver, and diffraction effects are infinitesimally small. Additionally, it is easy to control the frequency response, that permits compensation for distortions arising in external electronic circuits
Keywords :
capacitance; convolution; frequency response; interdigital transducers; surface acoustic wave convolution; 20 mus; 95 MHz; broadband SAW convolver; capacitive weighting; degenerate convolver; dispersive IDTs; distortion compensation; frequency response control; linear phase; Acoustic beams; Acoustic diffraction; Acoustic distortion; Apertures; Convolvers; Dispersion; Electronic circuits; Frequency response; Passband; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.583800
