Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1998-06-18
2000-07-18
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327552, 333172, 330303, H03K 500
Patent
active
060912898
ABSTRACT:
There is disclosed a low frequency filter. A low frequency cutoff filter includes a filter circuit having a capacitor connected between an input terminal and an output terminal and an active resistor connected to the output terminal, having a very large resistance, and a bias circuit having a negative feedback to set a biasing voltage of the active resistor to a desired value, thereby implementing the cutoff filter within a semiconductor chip as one set with the capacitor having a small capacitance. A low frequency pass filter includes an active resistor having a very large resistance, means for setting a biasing voltage of the active resistor to a desired value, and a capacitor connected between the output terminal and the ground. Therefore, the low pass filter can be integrated-circuited using even small capacitor.
REFERENCES:
patent: 4783635 (1988-11-01), Sevastopoulos
patent: 5296822 (1994-03-01), Cockey, IV
patent: 5572161 (1996-11-01), Meyers
patent: 5864256 (1999-01-01), Dick et al.
Kim Kyung Soo
Kim Ook
Kwon Jong Kee
Lee Jong Ryul
Oh Chang Jun
Electronics and Telecommunications Research Institute
Korea & Telecom
Le Dinh T.
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