Auto-ranging attenuators for read channels

Details Auto-ranging attenuators for read channels Auto-ranging attenuators for read channels

2006-07-04

2006-07-04

Young, Wayne (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

C360S067000, C360S068000, C330S12400D, C330S133000, C330S134000, C369S124110

Reexamination Certificate

active

07072130

ABSTRACT:
A recording system, such as a magnetic or optical recording system, sets input attenuation level setting and variable gain amplifier (VGA) operating region during zero gain start (ZGS) by sharing the ZGS adjustment between attenuator settings and VGS gain setting. Further adjustment is made to attenuator settings and VGS gain setting for each subsequent servo or read sector event. The input attenuation level setting and variable gain amplifier (VGA) operating region are set so as to minimize effects of gain error due to incorrect attenuator setting, and subsequently operate the VGA near the center of its range where the non-linear effects are minimal.

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