Method and apparatus for testing magnetic heads and disks

Details Method and apparatus for testing magnetic heads and disks Method and apparatus for testing magnetic heads and disks

1996-02-02

1998-06-02

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 51, 324210, 324212, G11B 2736, G11B 509, G01R 3312

Patent

active

057609829

ABSTRACT:
An apparatus for testing magnetic heads and disks comprises a phase locked loop (11) with a phase detector (13) formed by an analog-to-digital converter (40) and a digital-to-analog converter (50). A sine wave signal is supplied to an analog input of an ADC (40) and raw data pulses are supplied to the clock input the of ADC. A phase detector (13) detects deviations in the positions of raw data pulses from the zero crossings of the sine wave signal. A PLL (11) locks in the locations of the zero crossings of the sine wave signal and ADC samples constitute instantaneous values of a bit-shift distribution. These values are processed by a DSP (70). The resulting bit-shift distribution is generated during one disk revolution.

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patent: 5552942 (1996-09-01), Ziperovich et al.
patent: 5663945 (1997-09-01), Hayashi et al.
"Phase-Locked Loops" (Selected Papers) ed. by W. C. Lindsey & C. M. Chie, pp. 3 to 25 (IEEE Press, New York, 1986).
Handbook of Filter Synthesis by A. I. Zverev, pp. 1-3, (Wiley 1967).

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