Voltage controlled oscillator having temperature detecting...

Details Voltage controlled oscillator having temperature detecting... Voltage controlled oscillator having temperature detecting...

2011-07-19

2011-07-19

Kinkead, Arnold (Department: 2817)

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

C331S167000, C331S1170FE, C331S1170FE, C331S016000, C331S17700V

Reexamination Certificate

active

07982551

ABSTRACT:
A VCO circuit includes a temperature detector circuit, a voltage generator circuit, a switch, a resonance circuit and an oscillator. The temperature detector detects a temperature, and the voltage generator circuit generates a voltage for coarse adjustment corresponding to the detected temperature and outputs the same voltage. The switch selects one of a DC voltage for fine adjustment and the voltage for coarse adjustment. The resonance circuit includes a varactor diode having a capacitance value adjusted based on the voltage selected by the switch, capacitors and an inductor, and has a predetermined resonance frequency. The oscillator generates an oscillation signal having an oscillation frequency corresponding to the resonance frequency by using the resonance circuit and outputs the same signal.

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