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公开(公告)号：US5150080A
公开(公告)日：1992-09-22
申请号：US806956
申请日：1991-12-12
CPC分类号： H03L7/02 , H03B5/1864 , H03B2200/0024 , H03B2200/0048 , H03B2200/0056 , H03B2200/0072 , H03B2200/0088 , H03B2200/009 , H03B2201/0258 , H03B2202/025 , H03B2202/076 , H03B5/1841
摘要： An oscillator includes an amplifier having an input and an output and a feedback circuit disposed between the input and the output of the amplifier. The feedback circuit includes a plurality of resonators and a pair of switches. Each switch includes a first port and multiple connectable ports, the multiple connectable ports of each switch connected to a corresponding one of the plurality of resonators. The feedback circuit further includes a voltage-controlled phase shifter disposed in series with the switches. The oscillator further includes a discriminator circuit, responsive to signals from the feedback circuit, for providing a control signal to the voltage-controlled phase shifter for degenerating low frequency noise within the oscillator. With such an arrangement, high Q low noise resonators can be switched in and out of the circuit thus providing improved phase noise performance at high power levels with the desirable frequency agility required for a microwave oscillator.
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公开(公告)号：US5340980A
公开(公告)日：1994-08-23
申请号：US999645
申请日：1992-12-31
CPC分类号： H03L7/04
摘要： A microwave oscillator is shown to include an oscillator having an output and a control port and a feedback circuit disposed between the output and the control port of the oscillator. The feedback circuit includes a modulated laser, having an input and an output, the input responsive to a portion of a signal from the output of the oscillator and a photo detector having an input and an output, the input of the photo detector responsive to a signal from the output of the modulated laser delayed by a predetermined amount of time. The feedback circuit further includes a detector having a first and a second input and an output, the first input of the detector responsive to a signal from the output of the photo detector, the second input responsive to a portion of the signal from the output of the oscillator shifted in phase to be in phase quadrature with the signal at the first input of the detector and the output of the detector coupled to the control port of the oscillator. With such an arrangement, a microwave oscillator having improved FM noise performance than known microwave oscillators is provided.
摘要翻译： 微波振荡器被示为包括具有输出和控制端口的振荡器以及设置在振荡器的输出端和控制端口之间的反馈电路。 反馈电路包括具有输入和输出的调制激光器，该输入响应于来自振荡器的输出的信号的一部分和具有输入和输出的光电检测器，光电检测器的输入响应于 来自调制激光器的输出的信号延迟了预定的时间量。 所述反馈电路还包括具有第一和第二输入和输出的检测器，所述检测器的第一输入端响应于来自所述光电检测器的输出的信号，所述第二输入响应于来自所述光检测器的输出的信号的一部分 振荡器与检测器的第一输入端处的信号相位相位相位正交，并且检测器的输出耦合到振荡器的控制端口。 通过这样的布置，提供了一种具有比已知微波振荡器更好的FM噪声性能的微波振荡器。
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公开(公告)号：US5220292A
公开(公告)日：1993-06-15
申请号：US815981
申请日：1992-01-02
CPC分类号： H03L7/04
摘要： A microwave oscillator is shown to include an oscillator having an output and a control port and a feedback circuit disposed between the output and the control port of the oscillator. The feedback circuit includes a modulated laser, having an input and an output, the input responsive to a portion of a signal from the output of the oscillator and a photo detector having an input and an output, the input of the photo detector responsive to a signal from the output of the modulated laser delayed by a predetermined amount of time. The feedback circuit further includes a detector having a first and a second input and an output, the first input of the detector responsive to a signal from the output of the photo detector, the second input responsive to a portion of the signal from the output of the oscillator shifted in phase to be in phase quadrature with the signal at the first input of the detector and the output of the detector coupled to the control port of the oscillator. With such an arrangement, a microwave oscillator having improved FM noise performance than known microwave oscillators is provided.
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