Digital phase comparison apparatus

Details Digital phase comparison apparatus Digital phase comparison apparatus

1978-01-12

1980-01-15

Heyman, John S.

Oscillators

Relaxation oscillators

331 1A, 324 83D, 328155, H03D 302, H03B 304

Patent

active

041841220

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.degree.) and the second phase comparator has a substantially greater range (e.g. 720.degree.). 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.

REFERENCES:
patent: 3430148 (1969-02-01), Miki
patent: 3548321 (1970-12-01), Duquesne
patent: 3588710 (1971-06-01), Masters
patent: 3600690 (1971-08-01), White
patent: 3866129 (1975-02-01), Cornelissen
patent: 4020422 (1977-04-01), Underhill
patent: 4068181 (1978-01-01), Clark et al.

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