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A high-gain low-noise CMOS downconversion active folded mixer which can operate at 900 mV supply voltage is presented in this paper, and a LC circuit is introduced between the common source node of the switching pair to resonate out the parasitic capacitance in order to improve the performance. The mixer is designed in chartered 0.18-mum one-poly six-metal CMOS technology for 2.4 GHz ISM band applications. With an input 2.44 GHz RF signal of -50 dBm driven by a 2.442 GHz LO signal of 0 dBm, simulation results show that the conversion gain is 18.6 dB, the input/output-referred third-order intercept point are -8.77/9.88 dBm respectively, and the single-sideband noise figure is 7.15 dB. The power consumption of the mixer is 5.2 mW.