| 摘要 |
PROBLEM TO BE SOLVED: To provide a terrestrial digital broadcast receiving tuner which is capable of receiving a terrestrial digital broadcast of a plurality of channels of a UHF band with excellent interference durability and further can be driven with a low voltage. SOLUTION: UHF input tuner circuits 23, 24 each for dividing a UHF broadcast band into a plurality of bands and variably tuning to the UHF broadcast band so that a ratio of a peak frequency and a bottom frequency becomes 1.2 or less, are provided for each band, and signals outputted from the UHF input tuning circuits 23, 24 are alternatively inputted to a first mixer 30. An oscillation section 31 comprises a plurality of oscillation circuits 32, 33 corresponding to bands, a first local oscillation signal is supplied from the oscillation circuit 32, 33 corresponding to each of bands to the first mixer 30, and a common tuning voltage is supplied to the UHF input tuning circuits 23, 24 and the oscillation circuits 32, 33. COPYRIGHT: (C)2006,JPO&NCIPI
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