Cascaded surface acoustic wave filter system for cancelling time spurious responses
作者： David S. Yip
DOI:
关键词: m-derived filter 、 High-pass filter 、 Raised-cosine filter 、 Root-raised-cosine filter 、 Acoustics 、 Band-stop filter 、 Butterworth filter 、 Control theory 、 Low-pass filter 、 Physics 、 All-pass filter
摘要: A cascaded SAW filter system includes first and second filters ( 12 a , b ) each including an input transducer 36, 36 ′) output 37, 37 on piezoelectric substrate 38, 38 ′). Group delay pass band ripples associated with time spur at TD′ away from the main signal of cancel group TD because: 1) transducers 36′, are offset those ); 2) center frequency (f 0 is 3) perturbation region (P 1 different 2 or combination 1), and/or 3. The echo response will also be canceled. Also, spurs due to reflections ends can cancelled by adding dummy fingers end arid filter.
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