Malfunction detector for a group of cyclically interconnected ph

Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Malfunction detector for a group of cyclically interconnected ph does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Malfunction detector for a group of cyclically interconnected ph, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Malfunction detector for a group of cyclically interconnected ph will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-281833

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.