Active filter circuit and portable telephone apparatus

Details Active filter circuit and portable telephone apparatus Active filter circuit and portable telephone apparatus

1995-02-23

1996-10-15

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455311, 455313, 455339, H04B 110

Patent

active

055663656

ABSTRACT:
An active filter circuit used in a receiver circuit of a cellular telephone or the like has a voltage/current conversion circuit, an integrating circuit and a current dividing circuit. The voltage/current conversion circuit converts an input signal voltage to a signal current. The signal current output by the voltage/current conversion circuit is divided between the integrating circuit and ground. The current dividing circuit divides the signal current output by the voltage/current conversion circuit between the integrating circuit and ground. The current dividing circuit extracts low frequency components of the input signal voltage from the integrating circuit, and adjusts the cutoff frequency with respect to the extracted low frequency components to change the dividing ratio of the signal current output from the conversion circuit between the integrating circuit and ground.

REFERENCES:
patent: 4804904 (1989-02-01), Katakura
patent: 5030848 (1991-07-01), Wyattt
patent: 5053650 (1991-10-01), Ohkubo et al.
patent: 5081423 (1992-01-01), Koyama et al.
patent: 5266852 (1993-11-01), Shigenari et al.
patent: 5475331 (1995-12-01), Bult et al.

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