Phase detecting apparatus

Details Phase detecting apparatus Phase detecting apparatus

1984-11-20

1986-01-14

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 14, 331 25, 331 45, 328155, 363 53, 363 54, 363 87, 363128, 363129, H03L 706, H03B 2700, H02H 7125, H02M 7155, H02M 704

Patent

active

045648190

ABSTRACT:
A phase detecting apparatus comprises a first PLL and a second PLL having a response time shorter than the response time of the first PLL. An AC voltage signal produced by the first PLL which is in phase with the detected AC voltage except until the expiration of the response time of the first PLL after an abrupt change in the phase of the detected AC voltage is normally applied to the second PLL. Until expiration of the response time of the first PLL after rising of the detected AC voltage to a certain level, the detected AC voltage is applied, in place of the AC voltage signal produced by the first PLL, to the second PLL. The second PLL provides a digital signal indicative of the phase of the detected AC voltage.

REFERENCES:
patent: 4327420 (1982-04-01), Gdula
patent: 4438487 (1984-03-01), Kawai

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