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This paper presents a 900MHz low voltage, low power down-conversion mixer with high linearity for direct-conversion receivers. As a way to improve the third-order linearity, this paper proposes a very linear transconductance amplifier in which the size of the transistors is optimized to minimize the third-order intermodulation distortion (IMD3). A folded mixer topology is used in the designed mixer to enable the mixer to operate at low supply voltage. The design is based on a standard 0.25μm CMOS technology, and the simulation results show 15dBm of input IP3, 80dBm of input IP2, and -6.5dB of power conversion gain while dissipating a total current of 3mA from 1.25V supply.