Bandwidth enhancement of K-band CMOS mixer using balun matching for UWB radar

A K‐band double balanced mixer with 1.9 GHz ultra‐wide bandwidth in a 0.18 μm CMOS technology is presented in this article. Baluns with slot pattern ground were applied to the proposed mixer for an ultra‐wide band matching in RF and LO ports. The mixer down converts RF signals (23.1–25 GHz) to intermediate frequency signals (100 MHz–1 GHz) using a LO signal of 24.1 GHz. The mixer achieves a conversion gain of 3.4 dB with a RF signal of 24 GHz and a LO signal of 24.1 GHz. A 1 dB compression point of the mixer is −4 dBm, and the mixer consumes 20 mA current with a 1.8 V supply. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 232–235, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23991