| 摘要 |
A switch-type oscillating circuit includes a first oscillating circuit (1) for outputting an oscillation signal having a first frequency, which includes a first oscillation transistor (11) and a first switch circuit (12) for turning on and off the first oscillation transistor; a second oscillating circuit (2) for outputting an oscillation signal having a second frequency, which includes a second oscillation transistor (21) and a second switch circuit (22) for turning on and off the second oscillation transistor; and a coupling circuit (3) disposed between the output end of the first oscillating circuit and the output end of the second oscillating circuit, and the input end of a common circuit (4). A first low-pass filter circuit (117,118) is connected between the output end of the first oscillating circuit and a common potential point, for attenuating the oscillating signal having the second frequency; and a second low-pass filter circuit (217,218) is connected between the output end of the second oscillating circuit and the common potential point, for attenuating the oscillation signal having the first frequency. <IMAGE> |
