Current averaging data separator

Details Current averaging data separator Current averaging data separator

1990-07-13

1992-12-08

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

307262, 328155, 375119, G11B 509, H03K 500, H03K 513, H03D 324

Patent

active

051702975

ABSTRACT:
A data separator for use in synchronizing data derived from a floppy disk or similar data source provides a variable net gain or loss of charge to vary the frequency of a voltage-controlled oscillator in accordance with the relative position of the data with respect to the clock until data centering or synchronization is achieved. The net charge is derived from a charge pump circuit that is controlled by a charge pump-up signal whose duration is proportional to the detected phase difference between the data and the clock, and a charge pump-down signal whose duration is one clock cycle. When the data pulse is centered within a clock cycle, the duration of a pump-up signal is one half that of a pump-down signal.

REFERENCES:
patent: 4837643 (1989-06-01), Tierney, III

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