CMOS mixer linearization by the low-frequency signal injection method

Abstract

This paper presents, for the first time, the application of low-frequency signal injection technique to the linearization of a doubly balanced dual gate mixer. The down-conversion mixer is fabricated using 0.35 /spl mu/m CMOS technology and is designed to operate at 900 MHz RF input frequency with good port-to-port isolation, low LO power and current consumption. Reduction of third-order intermodulation distortion (IMD) level of almost 20 dB is achieved by the proposed scheme.