Title :
SAW programmable notch filters for adaptive interference suppression
Author :
Sugai, K. ; Takakuni, H. ; Noguchi, O. ; Omori, K.
Author_Institution :
Clarion Co. Ltd., Fukushima, Japan
Abstract :
The authors report a novel SAW (surface acoustic wave) programmable filter that uses Sezawa waves on a monolithic metal-ZnO-SiO 2-Si structure for adaptive interference suppression. The operation of the device is similar to that of those using Fourier transform schemes, except that the frequency separation is performed spatially. The programmability and the spectrum monitoring are performed by means of an acoustoelectric effect. The authors demonstrate a bandpass and a band-reject response of the filter with a center frequency of 213 MHz, bandwidth of ≃26 MHz, insertion loss of ≃27 dB, and out-of-band rejection of ≃35 dB. Programmable notch-filter behavior is demonstrated in a direct-sequence spread-spectrum receiver to suppress a single-tone interfering signal
Keywords :
Fourier transforms; II-VI semiconductors; interference suppression; notch filters; passive filters; radio receivers; silicon; silicon compounds; spread spectrum communication; surface acoustic wave filters; zinc compounds; 213 MHz; 26 MHz; 27 dB; Fourier transform schemes; Sezawa waves; ZnO-SiO2-Si structure; acoustoelectric effect; adaptive interference suppression; band-reject response; direct-sequence spread-spectrum receiver; frequency separation; insertion loss; monolithic structure; out-of-band rejection; semiconductors; single-tone interfering signal; spectrum monitoring; Acoustic waves; Acoustoelectric effects; Adaptive filters; Band pass filters; Fourier transforms; Frequency; Interference suppression; Monitoring; Surface acoustic wave devices; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1989. Proceedings., IEEE 1989
Conference_Location :
Montreal, Que.
DOI :
10.1109/ULTSYM.1989.66983
