| 摘要 |
PROBLEM TO BE SOLVED: To provide a temperature compensated oscillator that can be downsized by simplifying the circuit configuration and to attain ease of adjustment. SOLUTION: The temperature of an oscillation circuit 47 is detected by a temperature detection circuit 13, a cubic term voltage generation circuit of a control voltage generation circuit 23 generates a cubic term voltage as a control voltage based on an output voltage of the temperature detection circuit 13, and a frequency adjustment circuit 45 changes an oscillation frequency of the oscillation circuit 47 by the control voltage. The cubic term voltage generation circuit includes a first MOS transistor 37 having a source connected to a first power line 25, a second MOS transistor 35 having a source connected to a second power line 26, and digital control voltage division circuits 31, 33 for generating a first and a second gate voltage, respectively based on the output voltage of the temperature detection circuit 13, in which the first and second gate voltages are applied to gates of the first and second MOS transistors 37, 35 respectively, and a connection point 44 where respective drains are commonly connected functions as an output terminal of the control voltage.
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