Automatic gain control for magnetic disk-drive preamplifier

Details Automatic gain control for magnetic disk-drive preamplifier Automatic gain control for magnetic disk-drive preamplifier

2008-05-28

2010-11-16

Tzeng, Fred (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

Reexamination Certificate

active

07835098

ABSTRACT:
One embodiment of the invention includes a preamplifier system for a magnetic disk-drive. The system comprises a read amplifier configured to generate a read signal corresponding to data that is read from a magnetic disk via a magneto-resistive (MR) read head. The system also comprises a gain control amplifier that is configured to amplify the read signal based on a digital gain value to generate an amplified read signal. The system further comprises a feed-forward automatic gain controller (AGC) configured to set the digital gain value based on an amplitude of the read signal.

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