Data tracking clock recovery system using digitally...

Details Data tracking clock recovery system using digitally... Data tracking clock recovery system using digitally...

H - Electricity

03

L

328/87

H03L 7/08 (2006.01) G11B 20/14 (2006.01) H03L 7/085 (2006.01) H04L 7/033 (2006.01)

Patent

CA 1189577

ABSTRACT OF THE DISCLOSURE A clock recovery system according to the present disclos- ure includes a VCO responsive to a voltage signal for generating a clock signal. A phase detector includes a register and a PROM, the register counting the clock signal to derive the output clock sig- nal. The PROM is responsive to input data and the count in the register to detect and store information concerning relative phase relationships. A counter contains a count from which the control voltage for the VCO is derived. The PROM is operable to alter the count in the counter, thereby performing frequency adjustments, and to alter the count in the register to perform phase adjustments. Also, a converter, operable by the phase detector, may also derive a voltage signal for damping purposes.

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