Active frequency separating circuit

Details Active frequency separating circuit Active frequency separating circuit

1992-12-23

1995-01-03

Kuntz, Curtis

Telecommunications

Receiver or analog modulated signal frequency converter

Convertible to different type

4551881, 455281, H04B 118, H03H 746

Patent

active

053794524

ABSTRACT:
In an active circuit which separates and amplifies signals received via an antenna (A) into a higher-frequency FM band and a lower-frequency FM band, weakening of the FM signals by the AM-band amplifier is avoided by adding, to the previously known circuit which has first, second, and third capacitors (C1, C2, C3), a third inductance (L3) between the second (C2) and third (C3) capacitors, and by removing any serial inductance from the adaptor or matching circuit (AP) at the input of the FM amplifier stage (UKW).

REFERENCES:
patent: 3875514 (1975-04-01), Klein
patent: 3965426 (1976-06-01), Ringland
patent: 5140700 (1992-08-01), Kennedy
Sheffield, Berthold, "Filter Design Simplified", Audio Engineering, May 1951, pp. 26, 28, 58.

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