A high-efficiency and low-phase-noise 38-GHz pHEMT MMIC tripler

Frequency translation circuits are key elements in communication systems, T his paper presents a frequency tripler for 38-GHz short-range communication systems, designed using a pseudomorphic high electron-mobility field-effec t transistor (pHEMT) technology, The successful first iteration monolithic microwave integrated circuit achieved a state-of-the-art output power of 3. 1 dBm and a minimum conversion loss of 3.4 dB, The multiplier exhibits a co nversion efficiency of 11% and average phase noise degradation at 10 and 10 0 kHz offset frequency from carrier of 9 +/- 1 dB, Through a comprehensive study of the frequency multiplier, we demonstrate the optimum performance a chieved under a class B mode of operation, To our knowledge, this is the fi rst reported Ka-band single-stage frequency tripler based on pHEMT technolo gy that has been fully characterized for phase noise degradation.