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This paper presents a high linearity and low power up-conversion mixer at 5.2 GHz for wireless applications. The design based on Gilbert-cell active double-balanced mixer with integrated on-chip input active balun. Core mixer employs additional parallel capacitors and the degeneration inductors to obtain high linearity. A designed active balun which converts single-ended input to differential signals for 100 MHz intermediate frequency (IF) is proposed. The up-conversion mixer converts an input of 100 MHz IF signal to an output of 5.2 GHz radio frequency (RF) signal with a local oscillator (LO) frequency of 5.1 GHz. The simulation results indicated that the proposed method shows the conversion gain of 6-dB, the input third order intercept point (IIP3) of 8-Bm, and 2.48-mW power consumption at 1.8-V power supply.