Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1996-04-26
1997-12-30
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327555, 330305, 330306, H03K 501, H03K 5125
Patent
active
057035237
ABSTRACT:
A filter circuit having a signal input terminal and a signal output terminal includes a first and a second buffer. The first buffer has an input end connected to a first resistor and to a first capacitor. A second capacitor having one end is connected to an output end of the first buffer. A second resistor having one end is connected to the signal input terminal. The second buffer has an input end connected to the other end of the second resistor and to the other end of the second capacitor, and an output end connected to the signal output terminal. The filter circuit also includes a first signal supply circuit and a second signal supply circuit. The first signal supply circuit supplies a signal proportional to a difference between an output signal of the second buffer and a signal inputted from the signal input terminal, to the input end of the first buffer through the first resistor. The second signal supply circuit supplies a signal proportional to the signal inputted from the signal input terminal, to the input end of the first buffer through the first capacitor.
REFERENCES:
patent: 3792367 (1974-02-01), Fleischer et al.
patent: 4719512 (1988-01-01), Endo et al.
patent: 4851718 (1989-07-01), Hagino et al.
patent: 5192884 (1993-03-01), Kusano
patent: 5317217 (1994-05-01), Rieger et al.
patent: 5489873 (1996-02-01), Kamata et al.
patent: 5610551 (1997-03-01), Hosoya
Patent Abstracts of Japan, vol. 16, No. 492 (E-1278), Oct. 12, 1992 JP-A-4 180405.
Patent Abstracts of Japan, vol. 16, No. 579 (E-1299), Dec. 18, 1992 JP-A-4 230110.
Callahan Timothy P.
Englund Terry L.
Kabushiki Kaisha Toshiba
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