Apparatus for providing head amplitude characterization

Details Apparatus for providing head amplitude characterization Apparatus for providing head amplitude characterization

2006-04-11

2006-04-11

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

C360S025000, C360S031000, C360S032000

Reexamination Certificate

active

07027243

ABSTRACT:
An apparatus for providing head amplitude characterization is disclosed. A DAC is used to apply known signals to a variable gain amplifier in the front end of a read channel. The signal is processed through the read channel and at the output of an ADC, the signal is read and used to determine the input channel amplitude. Knowing the amplitude of the two input signals, the ADC code spread and the two VGA gain codes, an equation is generated for determining the amplitude of a head.

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