Disk drive comprising current sense circuitry for a voice...

Details Disk drive comprising current sense circuitry for a voice... Disk drive comprising current sense circuitry for a voice...

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

C360S078040, C360S078010

Reexamination Certificate

active

06850383

ABSTRACT:
A disk drive is disclosed comprising a voice coil motor (VCM) for actuating a head radially over a disk. A VCM driver comprises first and second transistors forming a common collector amplifier for sensing a current flowing through a voice coil of the VCM. The common collector amplifier improves the accuracy of the current sense measurement when the VCM is driven in a pulse width modulated (PWM) mode.

REFERENCES:
patent: 4160216 (1979-07-01), Thornton
patent: 5838515 (1998-11-01), Mortazavi et al.
patent: 5877914 (1999-03-01), Gontowski, Jr.
patent: 6084378 (2000-07-01), Carobolante
patent: 6094020 (2000-07-01), Goretzki et al.

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