Patent ID: 6288615
Filing Date: 2001-09-11
Classification: H03B

Abstract:
A switch-type oscillating circuit comprising:a first oscillating circuit to output an oscillation signal having a first frequency, including a first oscillation transistor and a first switch circuit to switch the first oscillation transistor between an operating state and a non-operating state;a second oscillating circuit to output an oscillation signal having a second frequency, including a second oscillation transistor and a second switch circuit to switch the second oscillation transistor between an operating state and a non-operating state;a coupling circuit disposed between an output end of said first oscillating circuit and an output end of said second oscillating circuit, and an input end of a common circuit;a first low-pass filter circuit connected between the output end of said first oscillating circuit and a common potential point, to attenuate the oscillation signal having the second frequency; anda second low-pass filter circuit connected between the output end of said second oscillating circuit and the common potential point, to attenuate the oscillation signal having the first frequency.