| 摘要 |
PROBLEM TO BE SOLVED: To provide a frequency conversion circuit, which can make a microcomputer integrated circuit(IC) common to frequency conversion circuits of a plurality of types provided for different input signal frequency bands. SOLUTION: The frequency conversion circuit is constituted by; local oscillators 25a, 25b for outputting local oscillation signals; mixers 24a, 24b for converting each signal distributed by a distributor for distributing a first frequency-band input signal into a second frequency-band signal; PLL-IC 32a, 32b for controlling oscillation frequency of local oscillation signals being output from the local oscillators 25a, 25b; and a microcomputer IC for controlling the PLL-IC 32a, 32b, using a voltage value being input to input ports, so as to output from local oscillators 25a, 25b the local oscillation signals corresponding to the first frequency-band input signal. |
