Signal processing circuit with feedback extracted from a sampled

Details Signal processing circuit with feedback extracted from a sampled Signal processing circuit with feedback extracted from a sampled

1997-07-11

2000-11-21

Tran, Thang V.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 51, G11B 509

Patent

active

06151179&

ABSTRACT:
A Class IV Partial Response Maximum Likelihood data channel for analog signal processing of a disk drive signal in tracking mode includes a signal error generating circuit for "folding" the analog disk drive signal around the three PR-IV target values of +1, -1 and 0. Using the smaller error signal rather than the larger analog disk drive signal by which the disk drive signal deviates from the target values results in significant power saving with no reduction in electronic signal to noise ratio. An integrated error generating circuit generates both a gain error signal and a timing error signal from the folded error signal for feedback control of the data channel variable gain amplifier and variable clock oscillator. Shared processing of the timing and gain error signals results in power savings and simpler circuitry.

REFERENCES:
patent: 5459757 (1995-10-01), Minuhin et al.
patent: 5796358 (1998-08-01), Shih et al.
patent: 5841602 (1998-11-01), Kanegae et al.

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