A High Linearity High Gain Double Balanced Down Conversion Mixer Using Current Bleeding for Mode 1 of UWB System

This work presents high linearity and high gain CMOS down conversion Gilbert cell mixer for ultra wide band application, designed in 0.18𝜇𝑚 technology. Inductive source degeneration is used at the RF trans-conductance stage of Gilbert cell mixer to improve the linearity of the mixer. Differential LC matching is used at RF and LO stage and current bleeding is used to increases the conversion gain and linearity of the mixer. Output buffer is used at the load to achieve 50 ohm impedance match. The proposed mixer shows low reflection coefficient less than –10 dB for entire band 1, band 2, and band 3 ranges from 3.168 GHz to 4.752 GHz frequency. The proposed mixer works at DC supply of 1.5 volt for low power consumption. Simulation results shows that the mixer achieves the conversion gain of 11.03 dB, 1 dB compression point of -14.65 dB, IIP3 is 0.257 dBm, input return loss is –24.292 dB and measured matched RF (input) port impedance of 48.79 ohm.