A high linearity down-conversion mixer for the application of the Fourth Generation (4G) mobile communication systems is presented. The presented 2.3 to 5.8GHz broadband mixer adopts current-reused and bulk-controlled techniques. The linearized trans-conductor stage is composed of the CMOS amplifiers and the Bulk-Controlled Compensation (BCC) transistors. The bulk-controlled voltage is applied to adjust the threshold voltage of the BCC transistor. Thus, the equivalent Third-order Inter-Modulation (IM3) term of the CMOS amplifiers and the BCC transistors can be mitigated so as to improve the linearity.