SAW电视中频滤波器三次行程的分析方法  

Analyze of Triple Transmit Signal in SAW TV-IF Filters

作　　者：徐劲波[1] 覃亚丽[1] 赵义祯[1] 叶程都[1] 

机构地区：[1]浙江工业大学信息工程学院光纤通信与信息工程研究所,杭州310014

出　　处：《中国新通信》2008年第3期42-44,共3页China New Telecommunications

摘　　要：随着立体声电视和高清晰度电视等的发展,对声表面波电视中频滤波器的性能提出了更严格的要求,首先介绍了声表面波电视中频滤波器三次行程反射问题形成的主要原因,由于它与主信号的幅度只差12dB,将会使滤波器的通带波动达到不可容许的地步,因此必须加以抑制,本文讨论了分别采用同相位法;声表面波单相单向换能器(Single Phase Unidirectional Transducer,SPUDT)来消除三次行程信号的影响。According to the development of stereo TV and High-Definition Television （HDTV）, it is push to improve the filter perfor-mance, some second order effects such as Triple Transmit Signal （TTS） must be compensated strictly. Besides,this paper also analyze simply the reason bringing TTS and measure of reducing it.The TTS effect in SAW filter is analyzed, then two methods are discussed, which are same phase method and SPUDT method. The Trs effect and the result of a SAW TV-IF filter is simulated.In addition,Single Phase Unidirectional Transducer （SPUDT） can be used in designing saw filter that can lower the insertion loss and improve the Triple Transmit Signal （TTS） suppression.

关 键 词：声表面波电视中频滤波器 三次行程 同相位法 SPUDT 

分 类 号：TN713[电子电信—电路与系统] TN949.1