Adaptively tuned clock recovery circuit

Details Adaptively tuned clock recovery circuit Adaptively tuned clock recovery circuit

H - Electricity

03

K

328/87

H03K 5/135 (2006.01) H04L 7/027 (2006.01) H04L 7/033 (2006.01) H04L 7/04 (2006.01)

Patent

CA 1207845

ADAPTIVELY TUNED CLOCK RECOVERY CIRCUIT Abstract of the Disclosure An adaptively tuned clock recovery circuit suitable for digroup terminal equipment comprises a reference pattern generator which generates two ones followed by fourteen zeros generated at the transmit clock rate. The pattern is applied to a tunable resonant circuit in the receive clock recovery circuit and the phase-difference between the free oscillations of the resonant circuit during the fourteen zeros and the transmit clock is detected. The resonant circuit frequency is automatically altered by switching capacitor in or out until the phase-difference is diminished to a predetermined value, whereupon the tuning process stops and the equipment is returned to normal operation. - i -

459496

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