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    • 9. 发明专利
    • MICROWAVE OSCILLATOR
    • JPH06244635A
    • 1994-09-02
    • JP11793
    • 1993-01-04
    • RAYTHEON CO
    • MAIKERU JIEI BIANCHINIRICHIYAADO EI MAIKARITSUKUJIYON EI CHIISAJIYOANNU MISUTORAA
    • H03B5/00H03L7/04H03L7/06
    • PURPOSE: To provide a microwave oscillator, whose FM noise characteristic is improved in comparison with a conventional microwave oscillator. CONSTITUTION: This device contains an oscillator 12 that has an output port and a control port and a feedback circuit 20, which is arranged between the output port and the control port of the oscillator 12. The circuit 20 has an input terminal and an outputting part and the input terminal is provided with a modulating laser 30, to which an output signal of the oscillator 12 is partially inputted, and a photodetector 34 which has an inputting part and an output terminal and the inputting part to which an output signal of the laser 30 is delayed only by a time previously defined and inputted. The circuit 20 has 1st and 2nd input terminals and output terminals, an output signal of the photodetector 34 is inputted to the 1st input terminal, the output signal of the oscillator 12 which has 90 deg. phase difference with respect to the signal of the 1st input signal is partially inputted to the 2nd input terminal, and the output terminal further contains a detector 28, that is connected to the control port of the oscillator 12.