| 摘要 |
PURPOSE: A digital tuner is provided to secure a signal level as an attenuation degree by attenuating a signal inputted through an attenuation unit. CONSTITUTION: A high frequency input unit(100) filters an input high frequency signal on a predetermined band. An MOPLL(Mixer Oscillator Phase Locked Loop) IC(Integrated Circuit)(110) converts the input high frequency signal into an intermediate frequency. An IF(Intermediate Frequency) amplification unit(120) performs filtering and amplifying of the intermediate frequency. A digital demodulation unit(130) demodulates the input IF into the original signal. An attenuation unit(140) attenuates high frequency signal level inputted to the high frequency input unit by a control voltage. [Reference numerals] (100) High frequency input unit; (110) MOPLL IC; (120) Intermediate frequency amplification unit; (130) Digital demodulation unit; (140) Attenuation unit
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