Lock Indicator for Phase-Locked Loops.
DEPARTMENT OF THE NAVY WASHINGTON D C
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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.
- Electrical and Electronic Equipment