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:

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.

Descriptors:

• *Phase locked systems
• *Patents
• Indicators
• Signals

Subject Categories:

• Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE