Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Patent
1990-06-22
1991-07-30
Pascal, Robert J.
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
331135, H03L 700
Patent
active
050362992
ABSTRACT:
Microwave oscilltors incorporate r.f. feedback with carrier suppression to reduce phase noise. In a direct feedback oscillator arrngement a circulator is interposed between the r.f. amplifier and the high-Q resonator. The amplifier output is applied to the slightly over-coupled input port of the resonator so that the resultant net return signal is the vectorial difference between the signals emitted and reflected from the resonator. The gain of the r.f. amplifier is chosen to regenerate the forward signal from the net return signal. In a STALO-type arrangement, the resonator is critically coupled and an r.f. amplifier added to the path of the net return signal. The sensitivity of the STALO-type feedback loop is thereby enhanced while added amplifier noise is minimized by the superposition of the signals emitted by and reflected from the resonator.
REFERENCES:
patent: 3577099 (1971-05-01), Hall et al.
patent: 3614649 (1971-10-01), Gerig
patent: 4916412 (1990-04-01), Nordholt et al.
Dick G. John
Saunders Jonathan E.
California Institute of Technology
Kramsky Elliott N.
Pascal Robert J.
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