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Television tuning circuit

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专利汇可以提供Television tuning circuit专利检索,专利查询,专利分析的服务。并且PURPOSE:To avoid image disturbance and secondary disturbance which could not be avoided by IF frequency of 58.75MHz, by providing a means for setting the IF frequency to 443.5MHz-469.75MHz, and separating a desired signal from a disturbance signal. CONSTITUTION:A VHF low channel (VL), a VHF high channel (VH) and UHF are separated by a BPF 2, a BPF 3 and a single tuning circuit 4, respectively, only one signal is fetched by a selecting circuit 5, and is sent to the next stage through an RF amplifier having an AGC characteristic, by a DC signal from a terminal A. An output of the selecting circuit 5 is supplied to a mixing circuit 6, is synthesized with an output signal of a local osciillator 7 by the mixing circuit 6, an output of the mixing circuit 6 is made to pass through an IF filter 8 set within 443.5-469.5MHz, and after that, is supplied to the output stage. As for the IF filter, any of an SAW filter, an LC filter and a coaxial oscillation filter is available.,下面是Television tuning circuit专利的具体信息内容。

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