Patent ID: 6970498

Claim:
A radio frequency (RF) receiver for a code division multiple access (CDMA) mobile communication base station system, which has a plurality of receive blocks receiving RF signals via a plurality of antennas, and a plurality of frequency allocation (FA)-based channel cards, the RF receiver comprising: an analog down-converting means for down-converting multi-FA RF signals on the respective reception paths output from the plural receive blocks to intermediate frequency (IF) signals; and a digital down-converting means for converting the IF signals of 3 FA's on the respective reception paths output from the analog down-converting means to digital signals by reception paths, dividing the digital signals into in-phase (I) and quadrature (Q) channels, converting the divided digital signals into I/Q channel baseband signals, and outputting the FA-based I/Q channel baseband signals to the channel cards corresponding to the respective FA's, wherein the analog down converting means comprises: a local oscillator on the individual reception paths for generating a local frequency; a mixer on the individual reception paths for mixing the local frequency generated from the local oscillator with the multi-PA RF signals on the individual reception paths output from the plural receive blocks to generate multi-FA IF signals on the individual reception paths; and an SAW filter on the individual reception paths for limiting the band of the multi-FA IF signals on the individual reception paths output from the individual mixer to the bandpass of a bandwidth corresponding to the multi-FA bandwidth.