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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.

40-GHz monolithic microwave integrated circuit (MMIC) single-pole-double-throw and multiple-port bandpass filter-integrated switches based on electronically switchable resonators are proposed. The proposed multifunction chip integrates a multiple-port switch with bandpass filter functions in a single chip. The switchable resonators are formed by quarter-wavelength stepped-impedance resonators with passive HEMT loading at one end. By properly allocating the resonant frequencies of the resonators in their on and off modes, a filter-integrated switch can perform a bandpass response with spurious suppression in the on state and achieve wideband isolation in the off state. The technique of using shared resonators is also introduced in the circuit design to reduce the overall circuit size. The results show the proposed circuits successfully integrate a MMIC switch with bandpass filter functions into a single circuit component.

A K-band power amplifier that dynamically adjusts the dc consumption based on the output power is presented. Compared with a fixed-bias PA that consumes a constant dc power of 265 mW, the proposed PA saves 157 mW at quiescent state and 88 mW when operated at P 1dB 6-dB back-off, and the OP 1dB of the PA is also extended. This is the first CMOS PA with effective enhancement in back-off efficiency near MMW region.