Timing recovery frequency error detector for sampled amplitude m

Details Timing recovery frequency error detector for sampled amplitude m Timing recovery frequency error detector for sampled amplitude m

1995-08-29

1997-06-24

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 32, G11B 500, G11B 509

Patent

active

056422431

ABSTRACT:
In a synchronous read channel for magnetic recording, a timing recovery phase-locked loop (PLL) comprises an improved discrete time frequency error detector for locking the PLL to a sinusoidal reference signal. The sinusoidal reference signal is sampled, and a frequency error is computed using three sample values which span more than half a period of the reference signal. Consequently, the frequency error detector is not affected by a DC offset in the reference signal, and it is less susceptible to noise due to an increase in sensitivity.

REFERENCES:
patent: 4970609 (1990-11-01), Cunningham et al.
patent: 5311178 (1994-05-01), Pan et al.
patent: 5359631 (1994-10-01), Behrens et al.
patent: 5406427 (1995-04-01), Shimoda
patent: 5416806 (1995-05-01), Coker et al.
patent: 5459757 (1995-10-01), Minuhin et al.
patent: 5465059 (1995-11-01), Pan et al.
patent: 5511098 (1996-04-01), Gardner

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