Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1994-12-23
1996-11-05
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
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.
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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.
Hase Kenichi
Horita Ryutaro
Kimura Hiroshi
Nara Takashi
Watanabe Kunio
Callahan Timothy P.
Hitachi , Ltd.
Le Dinh T.
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