Accession Number : ADD002115
Title : Lock Indicator for Phase-Locked Loops.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C
Personal Author(s) : Whitman,Edward C ; Blake,George B
Report Date : 01 Jul 1975
Pagination or Media Count : 6
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.
Descriptors : *Phase locked systems, *Patents, Indicators, Signals
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE