A Low Power 2.4GHz Double-Balanced CMOS Sub-harmonic Mixer

This paper presents a novel low power high linear sub-harmonic mixer for direct-down conversion receiver, in which an inductive connection between RF and LO stages is used to enhance the gain of mixer. A comparison is done between two circuits for two possible conditions, High Gain Medium Linearity (HGML) and High Linearity Medium Gain (HLMG), and recently published works. Simulation results performed by Advanced Design System (ADS) in 0.18¿m TSMC CMOS process show that the proposed mixer has exhibited better performance without increasing power consumption of 4.32mw. The inductive connection between RF and LO stages cases an enhancement of 7dB for conversion gain and 7dB for DSB NF. For HGML condition, it shows a conversion gain of 8dB, DSB noise figure of 13.88dB, input referred 1dB compression point of 0.5dBm and the IIP3 of -14dBm.