Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
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
Nakajima Shouji
Suzuki Hiroshi
Canney Vincent P.
Kabushiki Kaisha Toshiba
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