Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1990-06-15
1991-07-16
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 96, 331117D, H03B 518
Patent
active
050328000
ABSTRACT:
An oscillator providing predictable oscillator modulation sensitivity includes an amplifier and a feedback circuit disposed about the amplifier. The feedback circuit includes a resonator having a first port and a second port and a voltage-controlled phase shifter having an input port, an output port and a control port, the input port of the voltage-controlled phase shifter connected to the output port of the amplifier and the output port of the voltage-controlled phase shifter coupled to a port of the resonator. The oscillator further includes a circuit, responsive to signals from the output of the voltage-controlled phase shifter and the first port of the resonator, to provide a control signal to the control port of the voltage-controlled phase shifter for degenerating low frequency FM noise arising within the amplifier.
REFERENCES:
patent: 4555678 (1985-11-01), Galani et al.
patent: 4692714 (1987-09-01), Galani
patent: 4758800 (1988-07-01), DiBiase et al.
Osamu Ishihara et al., "A Highly Stabilized GaAs FET Oscillator Using a Dielectric Resonator Feedback Circuit in 9-14 GHz", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-28, No. 8, Aug. 1980, pp. 817-824.
Bianchini Michael J.
Galani Zvi
Waterman, Jr. Raymond C.
Grimm Siegfried H.
Mofford Donald F.
Raytheon Company
Sharkansky Richard M.
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