Constant bandwidth automatic gain control system

Details Constant bandwidth automatic gain control system Constant bandwidth automatic gain control system

1983-03-31

1985-02-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330284, H03G 310

Patent

active

045020213

ABSTRACT:
A constant bandwidth automatic gain control (AGC) system is presented. The system is especially suitable for use in the positioning servo system of a magnetic disk storage system. The system includes a double balanced modulator circuit and a fixed gain video amplifier circuit. The double balanced modulator circuit functions as a variable gain element, and the gain thereof is set by a control voltage derived from an otherwise conventional AGC loop. The gain of the current steering stage of the double balanced modulator is limited to values no greater than 0.5.

REFERENCES:
patent: 3581222 (1971-05-01), Dunwoodie
patent: 3757240 (1973-09-01), Fogg

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