| 摘要 |
PROBLEM TO BE SOLVED: To provide a double conversion tuner in a simple and inexpensive configuration by eliminating the use of a PLL circuit or the like for generating a local oscillation signal for a second mixer. SOLUTION: This device is provided with a first mixer 1, a second mixer 4 to input a signal from the first mixer 2 through a second band-pass filter(BPF) 3, a reference oscillator 12 for generating a reference oscillation signal and a local oscillation circuit 11 to input the reference oscillation signal. Then, a fourth BPF 13 is provided for inputting the local oscillation signal outputted from the local oscillation circuit 11 to the first mixer 2 and extracting the higher harmonic wave of a prescribed degree from the reference oscillation signal, and the higher harmonic wave extracted by the fourth BPF 13 is inputted to the second mixer 4.
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