An mm-Wave CMOS I-Q Subharmonic Resistive Mixer for Wideband Zero-IF Receivers
In this letter, we propose a novel wideband subharmonically pumped fully differential I–Q resistive mixer architecture, which eliminates the necessity for on-chip dc-blocking capacitors to integrate IF amplifiers. The proposed differential subharmonic mixer topology is verified by presenting a CMOS millimeter-wave monolithic integrated circuit (MMIC), which includes the mixer and two on-chip differential IF amplifiers at the mixer's I- and Q-channels. The 3-dB IF frequency bandwidth is measured from 0.01 to 5 GHz with a peak conversion gain (CG) of −2 dB and an image rejection ratio (IRR) of more than 25 dB over the IF frequency range. The proposed mixer covers the input signal (RF) frequency from 170 to 185 GHz. The mixer has also been tested with an on-chip voltage-controlled oscillator (VCO) and shows −4.7-dB CG with a 3-dB IF bandwidth from 0.01 to 4.5 GHz.
© 2020 IEEE. Manuscript received February 10, 2020; revised March 4, 2020; accepted March 9, 2020. Date of publication March 30, 2020; date of current version May 8, 2020. This work was supported in part by the Academy of Finland Projects through the MIDERI under Grant 310234, in part by the Finnish Funding Agency for Innovation (Business Finland) through the 5WAVE Project, and in part by the Jet Propulsion Laboratory (JPL), California Institute of Technology, through the National Aeronautics and Space Administration (NASA). The measurements were carried out at Millilab, the Millimeter Wave Laboratory of Finland, and the external laboratory of European Space Agency (ESA).