Disk drive comprising oscillators and counters for sensing...

Details Disk drive comprising oscillators and counters for sensing... Disk drive comprising oscillators and counters for sensing...

2005-02-01

2005-02-01

Tran, Sinh (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078010, C360S078040

Reexamination Certificate

active

06850384

ABSTRACT:
A disk drive is disclosed comprising a voice coil motor (VCM) driver including an H-bridge driver having a first sense resistor connected in series with a supply voltage and a second sense resistor connected in series with ground. First and second amplifiers amplify the voltages across the first and second sense resistors, wherein the output of the amplifiers drive respective first and second oscillators. A counter processes the frequency signals output by the oscillators to generate a digital representation of the current flowing through the voice coil of the VCM.

REFERENCES:
patent: 5838515 (1998-11-01), Mortazavi et al.
patent: 5898283 (1999-04-01), Bennett
patent: 6084378 (2000-07-01), Carobolante

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