Instantaneous phase detecting circuit and clock recovery...

Details Instantaneous phase detecting circuit and clock recovery... Instantaneous phase detecting circuit and clock recovery...

H - Electricity

04

L

H04L 27/22 (2006.01) H03D 13/00 (2006.01) H04L 7/027 (2006.01) H04L 7/033 (2006.01) H04L 25/06 (2006.01) H04L 7/04 (2006.01)

Patent

CA 2132442

This invention concerns an instantaneous phase detecting circuit and a clock regenerating signal generating circuit which are to be incorporated in a differential demodulator. The instantaneous phase detecting circuit (3A) is composed of logic circuits (31, 32, and 36), motion averaging filters (34 and 35), and a .pi./2-shifter (33). It obtains accurate phase detection by dividing an input signal into two parts, shifting one of the two parts of input signal by .pi./2 from the other part, and effecting the phase detection by using these two parts of input signal. The clock recovery signal generating circuit is composed of magnitude comparators, level setting circuits, a locus sorting circuit, and a timing control circuit. It effects the generation of a clock recovery signal by counting the timing of an input signal.

Un détecteur de phase instantanée (3A) comprend des circuits logiques (31, 32 et 36), des filtres à moyenne glissante (34 et 35), et un circuit (33) décalant les phases d'une valeur pi/2. Le signal entrée est divisé en deux. La phase de l'un des signaux entrée est décalée de l'autre d'une valeur pi/2. L'utilisation de ces deux signaux permet une mesure précise de la phase. Le générateur de signaux reproduisant des impulsions d'horloge comprend un comparateur de grandeur, un dispositif de fixation de niveau, un classificateur de locus, et un contrôleur de temps. Un signal reproduisant des impulsions d'horloge est généré par comptage du rythme des signaux entrée.

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