Design and Analysis of High Linearity Active CMOS Mixer with Resistive Source Degeneration Transconductor

In this paper a new highly linear CMOS mixer is proposed that utilizes simultaneously second and third-order distortion cancellation by using three resistive source degeneration trans conductor stages with an in-depth analysis of this stage. Simulations in a 0.18 um CMOS technology demonstrate that IIP3 and IIP2 of the proposed mixer have 8dB and 19dB improvements, respectively, compared with the conventional Gilbert-type mixer. The mixer has a gain of 6 dB and drawing 4 mA from 1.8V supply voltage.