FM resonant filter having AM frequency bypass

Details FM resonant filter having AM frequency bypass FM resonant filter having AM frequency bypass

1990-12-07

1992-08-18

Kuntz, Curtis

Telecommunications

Receiver or analog modulated signal frequency converter

Convertible to different type

4551881, 455340, H04B 1116

Patent

active

051407000

ABSTRACT:
A variable bandpass filter for filtering RF antenna signals to improve selectivity and reduce intermodulation distortion in an FM radio receiver includes a series resonant circuit which is modified to avoid blocking of AM signals. A bypass inductor is connected in parallel with the series resonant capacitor. The bypass inductor has a self-resonant frequency located between the AM and FM bands so that series resonant performance is maintained at FM frequencies and the bypassing function is exhibited at AM frequencies.

REFERENCES:
patent: 3360730 (1967-12-01), Sims
patent: 4157547 (1979-06-01), Freimark et al.
patent: 4334323 (1982-06-01), Moore
patent: 4406019 (1983-09-01), Ide et al.
patent: 4736457 (1988-04-01), Kupfer
patent: 4881272 (1989-11-01), Eguchi
patent: 4972353 (1990-11-01), Kennedy et al.
patent: 5020145 (1991-05-01), Hong
patent: 5040239 (1991-08-01), Kondo et al.

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