A compact and broadband 15 to 5 0 GHz resistive FET ring mixer using 0.18-,um CMOS technology is presented in this letter. This mixer exhibits a conversion loss of 13-17 dB and the port to port isolations of better than 3 0 dB from 15-50 GHz for both down and up-conversion with a chip size of 0.2 mm2• Besides, this mixer has an input PI dB of 4-1 0 dB and an IF bandwidth of 5GHz. To the author's knowledge, this is the highest frequency MMIC resistive FET ring mixer using CMOS technologies to date.

In this paper, a K-band frequency doubler with a tunable input matching network and LC reflector is first proposed and implemented using 0.18-m CMOS process. The conversion gain bandwidth is extended by the tunable input matching network and the tunable LC reflector can improve the fundamental rejection. This frequency doubler exhibits a conversion gain of -6~-8.3 dB from 18 to 26 GHz with 0 dBm input power and fundamental rejection of 32.5 to 44 dB. The dc power consumption is only 5.4 mW with a chip size of 0.55 x 0.46 mm 2 .

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