Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1993-03-24
1995-03-07
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
330107, 330288, 327 65, H03H 1112
Patent
active
053961889
ABSTRACT:
An active filter circuit has a filter circuit main part including a first conductance amplifier and a second conductance amplifier in which conductances are each proportional to currents or voltages of control input signals; a first signal generation circuit for generating a current or voltage which corresponds to a first signal; a second signal generation circuit for generating a current or voltage which corresponds to a second signal; a third signal generation circuit for generating a current or voltage which corresponds to a third signal; a first control signal generation circuit for generating a first control signal in accordance with a multiplication of the first signal and a fourth signal which is a ratio of the second signal to the third signal and supplying the multiplication signal to the first conductance amplifier; and second control signal generation circuit for generating a second control signal in accordance with a multiplication of the first signal and a fifth signal which is inverse ratio of the second signal to the third signal in order to independently adjust a cut-off frequency and a gain at this frequency.
REFERENCES:
patent: 3924199 (1975-12-01), Pearlman
patent: 4374335 (1983-02-01), Fukahori et al.
patent: 4881043 (1989-11-01), Jason
patent: 4922131 (1990-05-01), Anderson et al.
patent: 5138279 (1992-08-01), Kondo et al.
patent: 5182477 (1993-01-01), Yamasaki et al.
Callahan Timothy P.
Kabushiki Kaisha Toshiba
Le Dinh
LandOfFree
Active filter circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Active filter circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active filter circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1408836