| 摘要 |
A dual band oscillator is provided to prevent an oscillation signal outputted from one side oscillation transistor from being attenuated by an inductor connected to a collector of the other side oscillation transistor. In a dual band oscillator, a first oscillation transistor(11) outputs an oscillation signal of a first frequency bandwidth from a collector. A first inductor(12) supplies power to the collector of the first oscillation transistor(11). A first switching device(16) converts an operation/non-operation of the first oscillation transistor(11). The second oscillation transistor(21) outputs an oscillation signal of a second frequency bandwidth from a collector. A second inductor(22) supplies power to the collector of the second oscillation transistor(21). A second switching device(26) switches an operation/non-operation of the second oscillation transistor(21). An output terminal(30) outputs the oscillation signal of the first frequency bandwidth or the oscillation signal of the second frequency bandwidth to outside. And, the dual band oscillator is inserted between the first inductor(12) and the output terminal(30) through the first switching device(16) and inserted between the second inductor(22) and the output terminal(30) through the second switching device(26). |
