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A down-conversion active mixer for LTE receiver is proposed, which focus on improving the traditional subthreshold compensation method. The linearity is improved by adjusting the load inductance of transconductance stage and optimizing the phase of third-order transconductance coefficient; the noise is reduced with current injection technology. The designed active mixer is simulated with TSMC 0.18μm 1P6M CMOS technology. The results show that: the mixer can be operated at the 1.4-3.6 GHz band, and with the IIP3 of 5.6~ 10.7dBm, the SSB NF ranges from 9.4 to 13.6 dB, the gain ranges from -0.25 to 3.4 dB, the power consumption is 14.1mW with supply of 1.5V. The proposed mixer also has a merit of low NF and high linearity. Keywords-4G; down-conversion; threshold compensation; current bleeding;linearity

Design of Highly Linearity Active Mixer for 4G RF Receiver