A Direct-coupled Harmonic Rejection Mixer Employing IIP3 Improving Technology

This paper introduces a high linearity, low power wideband harmonic rejection mixer (HRM). By fully utilizing the modified differential multiple gated transistor (DMGTR) technique, a novel direct-coupled high linearity HRM is proposed. Implemented in a
$0.18-\mu\mathrm{m}$
CMOS process, and the current consumption is 6.20 mA under one 1.8-V supply. The measurements show that a 1.458-dB peak conversion gain, a 16.21-dBm IIP3, a 37.55-dBc 3rd harmonic rejection ratio (HRR) and a 67.52-dBc 5th HRR is obtained for a wide frequency range.