Disk drive with constant bandwidth automatic gain control

Details Disk drive with constant bandwidth automatic gain control Disk drive with constant bandwidth automatic gain control

1991-03-04

1993-06-15

Smith, Jerry

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 67, 330279, 307493, G11B 5596, G11B 502

Patent

active

052204685

ABSTRACT:
An automatic gain control circuit in which the gain of the gain controlled amplifier is controlled in an inverse exponential relationship with the amplitude of the output of said amplifier to provide a loop bandwidth that is essentially constant over variations in the strength of the input signals. The circuit is used in a magnetic disk drive to control amplification of detected servo signals to provide position and velocity error signals.

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IBM Tech. Disc. Bull., vol. 18, No. 10, Mar. 1976, pp. 3424-3425 Oswald, "Track Following Servo System".
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