Constant bandwidth automatic gain control

Details Constant bandwidth automatic gain control Constant bandwidth automatic gain control

1980-05-08

1982-04-20

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 67, G11B 2110, G11B 502

Patent

active

043262260

ABSTRACT:
An improved automatic gain control circuit suitable for use in the servo loop controlling the position of magnetic read/write heads with respect to magnetic disk data storage media is disclosed. The AGC circuit features a fast loop and a slow loop each of which loops contain gain varying elements, which in the preferred embodiment comprise field effect transistors. By using a reference voltage to control the operating point of the variable gain element in the fast loop, the effects of mechanical resonances on the servo data can be substantially eliminated while the overall AGC system response exhibits a substantially constant bandwidth.

REFERENCES:
patent: 4172267 (1979-10-01), Sidman

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