Calibration of analog front end for gain sensitive measurements

Details Calibration of analog front end for gain sensitive measurements Calibration of analog front end for gain sensitive measurements

2007-09-18

2007-09-18

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

C341S155000

Reexamination Certificate

active

11436824

ABSTRACT:
Methods of calibrating an analog front end (AFE) of a read/write channel include measuring a first magnitude of a test signal, measuring a second magnitude of an output signal of the AFE generated in response to the test signal, and comparing the first magnitude and the second magnitude to generate a measure of a gain of the AFE at a frequency of the test signal. A data storage device includes a read/write head configured to generate an analog input signal, an AFE coupled to the read/write head and configured to amplify and filter the analog input signal, a test signal generator configured to generate a test signal having a frequency substantially equal to a fundamental frequency of the analog input signal or any of its harmonics, and an attenuator coupled between the test signal generator and the AFE.

REFERENCES:
patent: 6222375 (2001-04-01), Fitzpatrick et al.
patent: 6256158 (2001-07-01), Brown et al.
patent: 7075748 (2006-07-01), White et al.
patent: 7113355 (2006-09-01), Hidaka

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