Automatic regulator of filter

Details Automatic regulator of filter Automatic regulator of filter

2006-07-12

2010-10-12

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Automatically controlled systems

C333S174000

Reexamination Certificate

active

07812685

ABSTRACT:
A second operational amplifier (7) is arranged, as an interface circuit (6), between a first operational amplifier (5) outputting the control voltage (Vcd) of a dummy filter (2) and a main filter (1), and the reference voltage (Vr) of the second operational amplifier (7) is optimized such that the control voltage (Vcd) obtained by using the dummy filter (2) is converted through the interface circuit (6) into a control voltage (Vcm) most suitable for the main filter (1), thereby obtaining a control voltage (Vcm) most suitable for regulating the frequency characteristics of the main filter (1) to desired characteristics.

REFERENCES:
patent: 4818903 (1989-04-01), Kawano
patent: 5179727 (1993-01-01), Imagawa
patent: 5200716 (1993-04-01), Amano
patent: 6307443 (2001-10-01), Gabara
patent: 04-077105 (1992-03-01), None
patent: 2000-040366 (2000-02-01), None
patent: 2001-308683 (2001-11-01), None
patent: 2005-286913 (2005-10-01), None

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