A new technique with two different structures for linearization of active mixers in zero-IF receivers is presented. The proposed technique improves the IIP2 more than 20dB by removing the transconductance common mode current at the mixer's output and IIP3 more than 5dB in comparison with a basic Gilbert-cell mixer at equal conversion gain. Also, this technique allows us to use a single-ended input in a fully differential structure without needing a bulky and noisy balun. These improvements are achieved at the cost of 0.8dB increase in NF and also 0.6 mA more current dissipation in one structure.