Oscillators – Automatic frequency stabilization using a phase or frequency... – Oscillator with distributed parameter-type discriminator
Patent
1988-05-09
1989-08-29
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Oscillator with distributed parameter-type discriminator
331 18, 331 25, H03L 706
Patent
active
048621080
ABSTRACT:
Circuit imperfections in phase modulators will introduce offsets in the servo error signals in frequency locking circuits. Such offsets will also cause a frequency offset. The frequency offset is first reduced by reducing or removing amplitude modulation at the modulating frequency in the modulated carrier signal. In the preferred embodiment, this is accomplished by a coupled servo which includes a matrix loop filter. After the amplitude modulation at the modulating frequency has been removed, sideband imbalance can be corrected by amplitude modulating the modulating signal so that the offset caused by sideband imbalance is reduced or eliminated. This will be the case provided that the integral of at least the third power of the amplitude modulation vanishes.
REFERENCES:
patent: 4631498 (1986-12-01), Cutler
Cutler, G. M., "Appendix A-Optical to Radio and Radio to Optical Frequency Locking" A Dissertation Submitted to the Department of Physics and the Committee on Graduate Studies of Stanford University, Mar. 1988, pp. 35-49.
Frazzini John A.
Hewlett--Packard Company
Mis David
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