Digital phase comparison apparatus

Details Digital phase comparison apparatus Digital phase comparison apparatus

H - Electricity

03

D

328/28

H03D 3/02 (2006.01) G01R 25/00 (2006.01) H03D 13/00 (2006.01) H03L 7/087 (2006.01) H03L 7/091 (2006.01)

Patent

CA 1110715

ABSTRACT Phase comparison apparatus, for example for use in phase lock loop (PLL) systems, comprises a first and a second phase comparator. The first comparator has a high gain (e.g. 1000) and a narrow phase difference range (e.g. 5°) and the second phase comparator has a substantially greater range (e.g. 720°). The second phase comparator is automatically switched out when the apparatus is operating in the narrow range and the outputs of the two comparators are proportionately combined in such a way that the combined output characteristic is linear over the whole range covered by the apparatus. The lock-up time of a PLL system using the apparatus is reduced by 10 to 100 times and system noise due to the apparatus can be reduced to negligible proportions.

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