Patent ID: 7629855

Claim:
A frequency-selective oscillator comprising: a first crystal resonator oscillating at a first frequency; a first oscillation circuit connected to the first crystal resonator; a second crystal resonator oscillating at a second frequency; and a second oscillation circuit connected to the second crystal resonator, wherein a common frequency-switching voltage signal is applied to selector terminals of the first oscillation circuit and the second oscillation circuit, a supply voltage is applied to a switching control terminal of the first oscillation circuit, a switching control terminal of the second oscillation circuit is grounded, output of the first oscillation circuit and output of the second oscillation circuit are connected and output from a first common signal line, and inverted output of the first oscillation circuit and inverted output of the second oscillation circuit are connected and output from a second common signal line, and the first common signal line and the second common signal line are connected through an inductor.