Digital Phase-Frequency Detector.

Abstract

A digital phase-frequency detector which provides rapid frequency acquisition and phase control when used in phase-locked loop applications. In a locked condition the output of a pair of flip-flop circuits are high causing an EXOR gate to produce a detector output, when unlocked a phase difference will increase until the higher frequency exhibits two positive transitions before one positive transition of the lower frequency can propagate through the circuit, this will cause the flip-flop receiving the higher frequency to change state thereby preventing the EXOR gate from gating and the other flip-flop from changing state, the flip-flop therefore controls the detector output until the two input frequencies again coincide and the output controlled by the EXOR gate. (Author)

Document Details

Document Type
Technical Report
Publication Date
Feb 16, 1979
Accession Number
ADD005937

Entities

People

  • T. H. Kimsey

Organizations

  • United States Department of the Air Force

Tags

DTIC Thesaurus Topics

  • Acquisition
  • Circuits
  • Detectors
  • Flip Flop Circuits
  • Frequency
  • Phase Control
  • Transitions
  • Warning Systems

Fields of Study

  • Physics

Readers

  • Control Systems Engineering.
  • Integrated Circuit Design and Technology.
  • Radar Systems Engineering.