Stabilized oscillator circuit
AssigneeKabushiki Kaisha Toshiba
InventorsAkio Naito, Atsushi Ogawa
Life of this patent
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Abstract
A stabilized oscillator circuit is provided with a differential amplifier type oscillator circuit for generating an oscillation signal, and a differential amplifier type buffer output circuit for amplifying and outputting the oscillation signal. The stabilized oscillator is also provided with a frequency variation stabilizing circuit. This circuit controls the amount of current of the constant current source I2 of the buffer output circuit, in accordance with fluctuations of the power supply voltage applied to the oscillator circuit. Accordingly, the collector-base capacitance of the transistors of the buffer output circuit is controlled, and the oscillation frequency variations are suppressed in spite of fluctuations of the power supply voltage.
Claims20
A stabilized oscillator circuit comprising:
- a differential amplifier type oscillator circuit;
- a differential buffer circuit for amplifying an oscillation signal of the differential amplifier type oscillator circuit and outputting the oscillation signal, the differential buffer circuit having a constant current source;
- and
- a frequency variation stabilizing circuit for controlling a current of the constant current source of the differential buffer circuit in accordance with a fluctuation of a power supply voltage applied to the differential amplifier type oscillator circuit to suppress a variation of a frequency of the oscillation signal.
A receiver comprising:
- a radio frequency amplifier;
- a local oscillator;
- a mixer for mixing an output frequency signal of the radio frequency amplifier with an output frequency signal of the local oscillator for frequency conversion;
- an intermediate frequency amplifier for receiving and amplifying an output frequency signal of the mixer;
- and
- a detector for detecting an output frequency signal of the intermediate frequency amplifier;
- in which said local oscillator includes:
- a differential amplifier type oscillator;
- a differential buffer for amplifying an oscillation signal of the differential amplifier type oscillator and outputting the oscillation signal, the differential buffer having a constant current source;
- and
- a frequency variation stabilizer for controlling a current of the constant current source of the differential buffer in accordance with a fluctuation of a power supply voltage applied to the differential amplifier type oscillator to suppress a variation of a frequency of the oscillation signal.
Dependencies are inferred from the claim text.