Differential phase-frequency detector
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United States of America Patent
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Apr 2, 2019
Grant Date -
Apr 19, 2018
app pub date -
Dec 15, 2017
filing date -
Nov 19, 2014
priority date (Note) -
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Abstract
A phase-frequency detector (PFD) is electrically coupled to a charge pump of a phase-locked-loop (PLL). The PFD includes a first differential latch electrically coupled to the charge pump. The first differential latch drives a differential pair of increment signals to the charge pump in response to differential pairs of both reference clock signals and reset signals. The PFD also includes a second differential latch electrically coupled to the charge pump. The second differential latch drives a differential pair of decrement signals to the charge pump in response to differential pairs of both feedback clock signals and reset signals. The PFD also includes a differential AND gate electrically coupled to both the first differential latch and the second differential latch. The differential AND gate drives the differential pair of reset signals to both of the differential latches in response to the differential pairs of both increment signals and decrement signals.
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