| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a signal changeover circuit that high isolation is attained and its current consumption, number of components of the circuit and number of wires in the circuit can be reduced. SOLUTION: First and second switch circuits 48, 49 are inserted between a selection circuit 47 and 1st and 2nd PLL local oscillators 44, 45. That is, either of output signals from the 1st and 2nd PLL local oscillators 44, 45 is fed to the selection circuit 47, and the other output signal is selected from the selection circuit 47 and the switch circuits 47, 48 are used as circuits to ensure isolation.</p> |
