Phase discriminator and data standardizer

Details Phase discriminator and data standardizer Phase discriminator and data standardizer

H - Electricity

03

L

328/28

H03L 7/08 (2006.01) G11B 5/09 (2006.01) G11B 20/10 (2006.01) H03D 13/00 (2006.01) H03L 7/089 (2006.01)

Patent

CA 1263454

PHASE DISCRIMINATOR AND DATA STANDARDIZER Abstract A phase discriminator and data standardizer apparatus measures phase difference between a data signal obtained from a magnetic disk device and a variable-frequency reference data clock. From the measured phase difference, the apparatus develops a phase differnce signal used to adjust the frequency of the reference data clock in order to reduce the phase difference. The apparatus includes a multi-state latch circuit that responds to the input data and clock signals by measuring the phase in a phase measurement transition cycle in which only one state variable changes at a time and producing the phase difference signal based upon the measurement. A gate responds to the measurement transition cycle by producing the phase difference signal. The apparatus further standardizes the input data so as to provide the data in a format that is predictably standardized in its time relationship to the reference data clock signal.

496976

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