Direct conversion receiving apparatus and celluar phone

Details Direct conversion receiving apparatus and celluar phone Direct conversion receiving apparatus and celluar phone

2005-06-29

2008-11-18

Urban, Edward (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S244100, C455S234200

Reexamination Certificate

active

07454186

ABSTRACT:
The direct conversion receiving apparatus has a gain control amplifier for variably amplifying a base band signal based on a gain switching control signal. A high pass filter has a first circuit including capacitors connected in parallel that are inserted in a path connecting an input terminal to an output terminal and switching effective total capacitance of the capacitors based on a first time constant switching control signal, and a second circuit including a resistor for providing a predetermined direct current voltage to the output terminal and switching the effective resistance value of the resistor based on a second time constant switching control signal. A control circuit outputs the gain switching control signal, and the first and second time constant switching control signals according to the change of the gain control of said gain control amplifier.

REFERENCES:
patent: 7003271 (2006-02-01), Kluge et al.
patent: 2003/0142767 (2003-07-01), Ichihara
patent: 2003-224489 (2003-08-01), None

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