| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage controlled oscillator that can suppress fluctuation in its oscillated frequency due to a temperature change. SOLUTION: A transistor(TR) 1115 acting as a constant current source in each of delay elements 111-114 generates a constant current depending on an input voltage 10. This current is supplied to two sets of inverters, which provide outputs OUT+, OUT- with inverted polarity. A discharging period of the TRs 1111, 1114 is shorter than a charging period of the TRs 1113, 1114 that receive a constant current and charges the output terminals. Thus, the effect due to temperature of the on-resistance of the TRs 1111, 1114 susceptible to a temperature change on the oscillated frequency can be reduced to suppress fluctuation in the oscillated frequency.
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