LOCK DETECTION CIRCUIT, OSCILLATION SOURCE CIRCUIT AND WIRELESS DEVICE

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United States of America Patent

APP PUB NO 20160344397A1
SERIAL NO

15142161

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A lock detection circuit includes: a phase difference detection circuit that detects a phase difference between a divided signal of an oscillation signal and a reference signal; a differentiation circuit that calculates a second differential value and a third differential value of the phase difference; and a synchronization detect circuit that detects the reference signal synchronizes with the oscillation signal, based on the secondary differential value and the third differential value.

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Patent Owner(s)

Patent OwnerAddress
FUJITSU LIMITED1-1 KAMIKODANAKA 4-CHOME NAKAHARA-KU KAWASAKI-SHI KANAGAWA 211-8588

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Matsumura, Hiroshi Isehara, JP 51 449

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