An Improved Current Bleeding Mixer Based on CMOS Technology

An improved current bleeding CMOS mixer is designed in this paper. The conversion gain of the mixer is increased and the flicker noise of the mixer is reduced by inserting the inductor to form resonant circuit with parasitic capacitors of the source ports of the switch transistors in Gilbert mixer. The mixer is designed by using SMIC 0.18 um CMOS process. The simulated results show that the mixer proposed has a 1.76dB increase of conversion gain, 2.1dBm improvement of IIP3, 0.5dB decrease of noise figure with local power of -3 dBm as compared with the mixer before inserting the inductor