NASA NTRS · 19770000357
Four-quadrant phase detector
Abstract
Phase detection circuit functions over full 360 degrees covering all four quadrants, and gives linear output that is proportional to phase difference. In addition, its output has single polarity; thus it is compatible with logic circuitry without need for additional processing.
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Manus, E. A., Wiley, H. P.. 1977-03-01. Four-quadrant phase detector. https://ntrs.nasa.gov/citations/19770000357
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