Adjustable bandwidth differentiating amplifier for a magnetic di

Details Adjustable bandwidth differentiating amplifier for a magnetic di Adjustable bandwidth differentiating amplifier for a magnetic di

1991-08-06

1992-10-20

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 65, 360 67, G11B 509, G11B 5035, G11B 502

Patent

active

051575590

ABSTRACT:
A variable bandwidth differentiating amplifier comprises a differential amplifier and a variable filter comprising a capacitor and a pair of diodes. A current source, having a current value derived from the track postion information in the track count register of a disk drive forward biases the diodes to alter the frequency response of the filter. A Gilbert multiplier may also be included to maintain a constant voltage gain for the differential amplifier.

REFERENCES:
patent: 4306198 (1981-12-01), Okada
patent: 4514704 (1985-04-01), Curtis
patent: 4564869 (1986-01-01), Baumeister
patent: 4575687 (1986-03-01), Moore, Jr.
patent: 4722010 (1986-01-01), Suzuki et al.
patent: 4772964 (1988-09-01), Kaida
patent: 4945311 (1990-07-01), Smith
Gray et al., Analog Integrated Circuits 2nd Ed., 1984, p. 597.

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