Constant bandwidth automatic gain control system

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

H - Electricity

03

G

330/104

H03G 3/00 (2006.01) G11B 5/596 (2006.01) H03G 1/00 (2006.01) H03G 3/30 (2006.01)

Patent

CA 1199986

ABSTRACT OF THE DISCLOSURE 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.

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