Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1985-02-04
1987-07-21
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
307516, 328133, 329 50, 329122, 331 17, 331 23, 331 27, 375 81, 375 94, 375120, H03L 702, H03D 318
Patent
active
046821210
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 difference 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.
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International Business Machines - Corporation
LaRoche Eugene R.
Lee James C.
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