Read circuit for floppy disk drive

Details Read circuit for floppy disk drive Read circuit for floppy disk drive

1986-04-28

1988-01-26

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 65, G11B 509, G11B 1514

Patent

active

047220104

ABSTRACT:
In a read circuit for an FDD, a differentiator is constituted by a pair of current control transistors connected differentially, and a series circuit of a capacitor, an inductor, and first and second resistors connected between the transistors. A switch is connected across one of the resistors. When a track counter detects an inner track, it supplies an active signal to the switch. The switch is closed to short-circuit the resistor, thereby decreasing the damping value of the differentiator.

REFERENCES:
patent: 4244008 (1981-01-01), Holt
patent: 4564869 (1986-01-01), Baumeister

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