Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1992-01-02
1993-06-15
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 9, 331 16, H03L 7085, H03L 716
Patent
active
052202925
ABSTRACT:
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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Bianchini Michael J.
Chiesa John A.
Michalik Richard A.
Mistler Joanne
Mis David
Mofford Donald F.
Raytheon Company
Sharkansky Richard M.
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