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从新的途径成功地研制出了两种采用SAW梳状滤波器的电视调谐系统。一是自动频道指示系统;另一是频率合成器。这种SAW梳状滤波器的梳状峯值位于信道频率处。对调谐器本振信号所通过的梳状峯值进行计数就可识别信道数。这种梳状滤波器的电极最小宽度只有1微米。它有制作在单片上的四组叉指换能器,可以复盖全部电视频道。
From the new approach successfully developed two kinds of TV tuner system using SAW comb filter. One is the automatic channel indication system; the other is the frequency synthesizer. The comb peak of this SAW comb filter is located at the channel frequency. The number of channels can be identified by counting comb-shaped peaks passed by the tuner local oscillator signal. The minimum width of this comb filter electrode is only 1 micron. It has four sets of interdigital transducers made on a single chip that covers all the television channels.