A temperature compensation type oscillator is provided with an oscillation circuit 20, a temperature detection circuit 18, and a temperature compensation circuit 30 for keeping the output signal frequency of the oscillation circuit 20 at a substantially constant value based on the temperature detection signal, and a selection circuit 40 for selecting whether the temperature compensation function of the temperature compensation circuit 30 is to be set in a valid or invalid state. 発振回路20と温度検出回路18と、その温度検出信号に基づいて発振回路20の出力信号の周波数を略一定値に保つための温度補償回路30とを備え、その温度補償回路30の温度補償機能を有効状態にするか又は無効状態にするかを選択する選択回路40を設ける。 - 特許庁