A 0.18 μm CMOS single-balanced mixer with LO cancellation for MB-OFDM UWB direct conversion receiver applications

This article presents an effective methodology for designing a CMOS single-balanced down conversion mixer with LO cancellation for MB-OFDM UWB direct-conversion receiver. The most crucial drawback of single-balanced mixer; LO feedthrough is overcome by employing BPF technique for multi-channel LO signal. The proposed single-balanced mixer is implemented with 0.18 μm CMOS technology and it operates from 3 to 5 GHz frequency range. The measurement result shows that LO signal amplitude is less than IF signal, the IIP3 is 1 dBm at 4-GHz band, and the current consumption is 6 mA. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2555–2558, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22793