%0 Journal Article
%T A 20-31 GHz High Image Rejection Ratio Subharmonic Mixer
%A Yi-Chang Lee
%A Chien-Hung Liu
%A Shih-Han Hung
%A Chun-Chi Su
%A Yeong-Her Wang
%J PIER    C
%D 2012
%I EMW Publishing
%R 10.2528/PIERC12011115
%X A broadband monolithic image rejection subharmonic mixer using a standard 0.18 ¦Ìm CMOS technology is proposed. This circuit is composed of a band-pass filter with an intermediate frequency (IF) extraction function that can simplify the block diagram of the image rejection mixer. The entire passive circuit is constructed using a broadside coupling structure to achieve a high level of integration. Based on measured results, the proposed mixer exhibits conversion loss of 15.5-18.5 dB at a local oscillator (LO) power of 13 dBm, whereas the 3 dB bandwidth ranges from 20 to 31 GHz (43.1%) with a miniature chip dimension of 0.77¡Á0.81 mm. The LO-to-radio frequency (RF), 2LO-to-RF, and RF-to-IF isolation levels are higher than 22.5, 42.9, and 34.5 dB, respectively. The best image rejection ratio of 29 dBc with 20¡ã phase compensation at 24.5 GHz can be achieved.
%U http://www.jpier.org/pierc/pier.php?paper=12011115