Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2006-05-02
2006-05-02
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
Reexamination Certificate
active
07038531
ABSTRACT:
An active filter comprising a first operational amplifier (10) disposed in an inverting integral configuration through a feedback capacitor (14) and a main resistor (15), and a divider (20) connected through a first connecting terminal (22) thereof with a noninverting input (12) of the first operational amplifier (10). In a second embodiment filter1comprises a main operational amplifier (100) dispose in an inverting integral configuration through a capacitor (101) and a resistor (102), and a secondary operational amplifier (110) fed back through feedback means (120) and connected with the main operational amplifier (100) through a resistor (130). An inverting input (110a) of the secondary operational amplifier (110) is connected with a noninverting input (100b) of the main operational amplifier (100).
REFERENCES:
patent: 3696252 (1972-10-01), Chapman
patent: 3919648 (1975-11-01), Uetrecht
patent: 3999137 (1976-12-01), Fucito
patent: 4301419 (1981-11-01), Calomiris
patent: 4453132 (1984-06-01), Stamler
patent: 4659995 (1987-04-01), Feistel
patent: 4975653 (1990-12-01), Kennedy et al.
patent: 1998RE00057 (1998-12-01), None
1980 IEEE International Symposium on cas proceedings, Apr. 28-30 1980, Houston Texas: A. Soliman et al: “A universal variable 3-port VCVS and its application in two-integrator loop filters”; pp. 83-86 XP002240261 the whole document.
Le Dinh T.
Pearne & Gordon LLP
LandOfFree
Active filter 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, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3580220