A reconfigurable IF receiver supporting intra-band non-contiguous carrier aggregation is proposed. By utilizing the harmonic rejection (HR) mixer with 12-phase LOs and phase-shift-adding configuration, the IF receiver could eliminate the channel interferences, which is robust to the mismatch. The IF receiver has been implemented in 65nm CMOS, and the simulate d results show that the interference between different channels is below -59dBc, and the IF receiver achieves -12.16dBm-6.52dBm input P1dB, with 21.71mA~23.39mA current consumption from one 1.2 V power supply.