Integrated filter circuit having switchable selected parallel fi

Details Integrated filter circuit having switchable selected parallel fi Integrated filter circuit having switchable selected parallel fi

1986-05-14

1988-02-09

LaRoche, Eugene R.

Wave transmission lines and networks

Automatically controlled systems

Impedance matching

333101, 333103, 333172, 333174, 330 51, H03H 7065, H03H 1104

Patent

active

047244070

ABSTRACT:
An integrated filter circuit including at least integrated resistances and integrated capacitances, said integrated filter circuit comprising a plurality of filter circuits connected in parallel and in which at least either resistance values or capacitance values are different, a switch for switching said parallel filter circuits, and means for controlling said switch to select one of said parallel filter circuits.

REFERENCES:
patent: 3411098 (1968-11-01), Perra
patent: 3533020 (1970-10-01), Hecht
patent: 3582835 (1971-06-01), Walding
patent: 3611154 (1971-10-01), Kupfer
patent: 3742395 (1973-06-01), Yoneyoma
patent: 4197515 (1980-04-01), Hornfeldt et al.
patent: 4302738 (1981-11-01), Cabot et al.
patent: 4319207 (1982-03-01), Gignoux
patent: 4378538 (1983-03-01), Gignoux
patent: 4480338 (1984-10-01), Dobiovolny
Electronics Letters, vol. 17, No. 12, 11th Jun. 1981, pp. 406-407; Longdon, GB; Y. Tsividis: "Self-Tuned Filters".
Electronic Components and Applications, vol. 2, No. 1, Nov. 1979, pp. 16-26, Eindhoven, NL; E. A. Kilian: "Part 5--DC-Controlled Audio Switches and Filters".

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