A Reconfigurable Mixer for 1.8-5GHz Software-Defined Radios

This paper demonstrates a reconfigurable current bleeding mixer using SiGe 8HP process due to its high performance. In this work a down-conversion mixer has been proposed which is based on a double-balanced topology. The mixer operates between 1.8GHz and 5GHz, LO as 1.9GHz, and results affirm its feasibility for software-defined radio applications. The impedance matching section consists of varactors and spiral inductors to match at different frequencies within a band. The analysis shows that the proposed mixer design has a high conversion gain of 13.5-18.5 dB with a noise figure of 1.2-1.8 dB and dissipated 10mW power. The mixer operates at 1.2V and has moderate linearity performance with CP1 of -17.1 dBm and IIP3 as -3.89dBm.