Coded data generation or conversion – Digital code to digital code converters – To or from nrz codes
Patent
1998-05-20
2000-10-17
Young, Brian
Coded data generation or conversion
Digital code to digital code converters
To or from nrz codes
327157, H03M 506
Patent
active
061338613
ABSTRACT:
Precompensated NRZ-encoded data for writing to magnetic storage medium operates with multiple NRZI-to-NRZ decoders that are each supplied with a selectably-variable version of a master clock. The delayed versions of the master clock are stably produced by delay elements operating with D-flip flops and charge pumps in a delay-locked feedback loop. The direction of current supplied to or from a capacitor by the charge-pump during a cycle of delayed clock signal is controlled by the delayed clock signal for shaping the feedback signal to trigger appropriately the next cycle of the delayed clock signal. The duration of the selectable delay is adjusted by setting the amplitudes of the charge and discharge currents supplied by the charge-pump. Stable delayed versions of the master clock promote reliable conversions of NRZI data to write precompensated NRZ recordable data.
REFERENCES:
patent: 4623805 (1986-11-01), Flora et al.
patent: 5159205 (1992-10-01), Gorecki et al.
patent: 5642068 (1997-06-01), Wojcicki et al.
patent: 5777567 (1998-07-01), Murata et al.
Jusuf Gani
Sutardja Pantas
Jean Pierre Peguy
Marvell Technology Group
Young Brian
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