Oscillator circuit with temperature compensation function
AssigneeOki Electric Industry Co., Ltd.
InventorKen Fujita
Life of this patent
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Abstract
An oscillator circuit comprising a resonant circuit which includes a negative resistor, an inductor and an oscillation frequency setting capacitor whose capacitance is varied according to a control voltage based on oscillation frequency data and which outputs a signal having an oscillation frequency based on the oscillation frequency data, a temperature detector which outputs temperature compensation data, based on the temperature, and temperature compensating capacitors which are electrically connected to the resonant circuit and which are supplied with the temperature compensation data to change capacitance values thereof based on the temperature compensation data, thereby adjusting the oscillation frequency.
Claims10
An oscillator circuit comprising:
- a resonant circuit including a negative resistor, an inductor and an oscillation frequency setting capacitor having a variable capacitance according to a control voltage based on oscillation frequency data and outputting a signal having an oscillation frequency based on the oscillation frequency data;
- a temperature detector detecting temperature and generating temperature compensation data based on the detected temperature;
- and
- a temperature compensating capacitor which is electrically connected to the resonant circuit and changed in capacitance value based on the temperature compensation data so as to adjust the oscillation frequency.
An oscillator circuit comprising:
- a monitor circuit for monitoring a low pass filter voltage, the monitor circuit having a reference voltage input, an input for receiving a low pass filter signal and a monitor output;
- a voltage-controlled oscillator having a negative resistor, an inductor connected in parallel with the negative resistor, a first oscillation frequency setting capacitor connected in parallel with the negative resistor, the first oscillation frequency setting capacitor having a variable capacitance that is changed in response to a temperature compensation signal received thereto, and a plurality of device characteristic compensation data capacitors connected in parallel with the negative resistor;
- and
- a buffer circuit connected to the negative resistor for outputting a frequency division signal.
Dependencies are inferred from the claim text.