Differentiating amplifier responsive to track locations and vari

Details Differentiating amplifier responsive to track locations and vari Differentiating amplifier responsive to track locations and vari

1993-01-19

1994-01-11

Hajec, Donald

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

052787001

ABSTRACT:
An amplifier is compensated for variations in element values. A trim signal is generated based on element values of filter elements of a filter in the amplifier. An RC product in the amplifier is controlled based on the trim signal. The RC product corresponds to a product of a dynamic resistance value of a dynamic resistance element in the filter in the amplifier, and a capacitance value of capacitive elements in the filter. The RC product also determines a pole position of the amplifier. Gain in the amplifier is controlled based on the trim signal so that a desired gain is maintained.

REFERENCES:
patent: 3838210 (1974-09-01), Peil
patent: 4586155 (1986-04-01), Gilbert
patent: 4691120 (1987-09-01), Kondo
patent: 4694204 (1987-09-01), Nishijima et al.
patent: 4713628 (1987-12-01), Nelson
patent: 4748422 (1988-05-01), Matsumoto
patent: 4881043 (1989-11-01), Jason
patent: 4888502 (1989-12-01), Jarrett
patent: 5157559 (1992-10-01), Gleason et al.

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