Design of Self-Differential Down-Conversion I/Q Mixer for 2.4 GHz IoT Application

Abstract

A 2.4 GHz self-differential down-conversion Gilbert cell mixer with current-reuse topology is presented in this paper. This design is targeted for low-power IoT applications. Here, by using a novel self-differential RF input stage with current-reuse topology, the single-ended RF signal can be transferred into differential signals without using a balun. With an applied local oscillator (LO) power of 10 dBm and RF signal of -30 dBm, this mixer demonstrates 9.886 dB of conversion gain, 10.4 dB of noise figure at 5 MHz and an IIP3 of 1.1767dBm in both I/Q branch. The design consumes 1.57 mA from a 1.8 V voltage supply.