Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled
Patent
1979-06-29
1981-10-27
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural oscillators controlled
331 49, 331 55, H03L 700
Patent
active
042976499
ABSTRACT:
Three or more oscillators to be locked in phase with one another are interconnected in a closed ring and have individual feedback loops including respective frequency dividers designed to keep them in step with a synchronizing frequency, equal to a fraction of their own operating frequency, fed in through an associated multiplexer. The multiplexer has a first input receiving the stepped-down feedback frequency of the immediately preceding oscillator, a second input connected to the output of the associated frequency divider, and a third input energizable with an external reference frequency such as a carrier of a PCM of FDM system. Each multiplexer, in the absence of an external switching command which holds it on its third input, stands on its first input unless a control circuit associated with the immediately preceding oscillator detects a disparity between the two frequencies fed to that preceding oscillator via the feedback loop and the multiplexer of the latter. In the event of such a disparity, indicating a malfunction of the oscillator associated with the control circuit detecting same, the multiplexer associated with the next-following oscillator is switched onto its second input to transform the phase-locking ring into an open-ended cascade, with emission of an alarm signal identifying the defective oscillator. Each frequency divider is provided with a self-checking circuit emitting a different alarm signal in the event of a malfunction thereof.
REFERENCES:
patent: 3369190 (1968-02-01), Pope
patent: 3662277 (1972-05-01), White
Marchelli Francesco
Sbuelz Anes
Grimm Siegfried H.
Ross Karl F.
Societa Italiana Telecomunicazioni Siemens S.p.A.
Westin Edward P.
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