Disk file servo loop with improved track settling

Details Disk file servo loop with improved track settling Disk file servo loop with improved track settling

1990-04-13

1991-10-29

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7702, 369 4428, G11B 555, G11B 2108

Patent

active

050620231

ABSTRACT:
Reduced integration time within a lead-lag compensation circuit within a disk drive head positioner servo loop is reduced in the presence of a feed back position error signal which includes a bias force component. The compensation circuit including an integrating capacitor and a high value resistor through which the integrating capacitor is charged by the position error signal. Charging time of the integrating capacitor is reduced during track settling by a parallel resistance switchably connectable across the high value resistor for lowering the resistance thereof. A switch, such as a field effect transistor in series with the parallel resistance, connects the parallel resistance across the high value resistor in response to a switching signal. A control circuit, such as a system microprocessor, is responsive to the head positioner servo loop and generates the switching signal to cause the switch to connect the parallel resistance means across the high value resistor during a settle interval immediately following completion of track seeking when the servo loop is functioning in a track following mode and before track seeking is complete.

REFERENCES:
patent: 4516177 (1985-05-01), Moon et al.
patent: 4783705 (1988-11-01), Moon et al.
R. K. Oswald, "Design of a Disk File Head-Positioning Servo", IBM Journal of Research and Development, Nov. 1974, pp. 506-512.

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