Apparatus for improving intermodulation distortion...

Details Apparatus for improving intermodulation distortion... Apparatus for improving intermodulation distortion...

2005-08-30

2005-08-30

Phu, Phuong (Department: 2631)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S345000, C375S350000, C375S316000, C330S149000, C455S296000

Reexamination Certificate

active

06937675

ABSTRACT:
Disclosed is an apparatus for improving an intermodulation distortion characteristic by controlling a gain of an attenuator in a CDMA mobile terminal. The apparatus includes a converter for passing input signal components except an IF signal component, amplifying the passed input signal to a specific level, converting the amplified signal to a DC signal, comparing the DC signal with first and second thresholds, and generating a control signal for controlling an operating point of the attenuator by synthesizing the compared result signals.

REFERENCES:
patent: 4329655 (1982-05-01), Nojima et al.
patent: 5396189 (1995-03-01), Hays
patent: 5603114 (1997-02-01), Tomita
patent: 5999559 (1999-12-01), Takaki
patent: 6205189 (2001-03-01), Ha
patent: 6208849 (2001-03-01), Cho et al.

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