ANALOG FRACTIONAL-N PHASE-LOCKED LOOP

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United States of America Patent

SERIAL NO

15629509

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Abstract

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An analog fractional-N phase-locked loop includes an oscillator loop having a reference input, a feedback input, and a loop output, and a fractional feedback divider configured to divide signals on the loop output by a divisor. Output of the fractional feedback divider is fed back to the feedback input. A compensation circuit is coupled to, and configured to apply a time delay to, the reference input or the feedback input, to compensate for delay introduced by the fractional feedback divider. The compensation circuit may be a digital-to-time converter configured to convert a digital delay signal into the time delay. The digital-to-time converter may be coupled to the reference input to delay signals to match feedback delay introduced by the fractional feedback divider, or to the feedback input to subtract the time delay to cancel feedback delay introduced by the fractional feedback divider.

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Patent Owner(s)

Patent OwnerAddress
MARVELL WORLD TRADE LTDL'HORIZON GUNSITE ROAD BRITTONS HILL ST MICHAEL BB14027

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Burg, Olivier Lausanne, CH 10 46
Gao, Xiang Fremont, US 132 1351
Tu, Cao-Thong Preverenges, CH 13 76
Wang, Haisong Crissier, CH 40 75

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