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Accession Number:
ADD002115
Title:
Lock Indicator for Phase-Locked Loops.
Descriptive Note:
Patent,
Corporate Author:
DEPARTMENT OF THE NAVY WASHINGTON D C
Report Date:
1975-07-01
Pagination or Media Count:
6.0
Abstract:
The patent relates to apparatus for indicating that a phase-locked loop has locked onto a periodic signal using a second auxiliary phase-locked loop to which the incoming signal is fed in parallel with the primary phase locked loop. If the signal is acquired by both, an exclusive OR gate produces a continuous zero output, indicating that a lock-up has occurred.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE