Filter circuit permitting adjustment of cutoff frequency

Details Filter circuit permitting adjustment of cutoff frequency Filter circuit permitting adjustment of cutoff frequency

2007-12-18

2007-12-18

Le, Thanh Cong (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S340000

Reexamination Certificate

active

11043985

ABSTRACT:
A filter circuit, having a plurality of selectable impedance elements, that has a cutoff frequency dependent on a selected impedance element, comprises a pulse generation circuit that supplies a variable frequency pulse with a successively increasing or decreasing frequency to an input of the filter circuit; and an impedance element selection unit that checks the attenuation of the output pulse of the filter circuit corresponding with the input of the variable frequency pulse and selects the plurality of impedance elements on the basis of the position of a pulse that is attenuated to or below a reference value.

REFERENCES:
patent: 3633134 (1972-01-01), Barrows et al.
patent: 5499392 (1996-03-01), Grunwell
patent: 6377788 (2002-04-01), Elder et al.
patent: 6-251303 (1994-09-01), None
patent: 11-31936 (1999-02-01), None
patent: 2002-176329 (2002-06-01), None

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