Active filter control apparatus

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

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327551, 327552, 330305, 360 65, 360 46, H03B 500, H03H 1104

Patent

active

055721630

ABSTRACT:
An active filter control apparatus for controlling or tuning an active filter having a variable cut-off frequency. The active filter control apparatus includes a control circuit for controlling or tuning the cut-off frequency of the active filter and a characteristic correction generator for generating a correction signal to correct a group delay characteristic of the active filter in accordance with a set cut-off frequency. The characteristic correction includes a correction signal generator for generating the correction signal in accordance with a set correction amount. The cut-off frequency controller controls tunes the characteristic of the active filter in accordance with the correction signal. Preferably, the apparatus is formed of a one-chip LSI integrated on one chip. The control apparatus can be utilized to control the speed in a recording/reproducing apparatus such as a optical disk drive or a magnetic tape drive apparatus.

REFERENCES:
patent: 5117205 (1992-05-01), Nauta
patent: 5200716 (1993-04-01), Amano
patent: 5270875 (1993-12-01), Shah et al.
patent: 5432562 (1995-07-01), Van De Waterlaat et al.
patent: 5440264 (1995-08-01), Sevenhans et al.
Vierman, "Design of a Bipolar 10-MHz Programmable Continuous-Time 0.05.degree. Equiripple Linear Phase Filter," IEEE Journal of Solid-State Circuits, vol. 27, No. 3, Mar., 1992, pp. 324-331.

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