Abstract
With the growth of the IT industry, the technologies of communication arouse more and more attention in these years. Microwave wireless communication using high frequency can relax the crowded low frequency band. Besides, wide bandwidth can accommodate more applications. In this work, four wide-band balanced amplifiers designed at K/Ka Band were presented. Two balanced amplifiers used standard CMOS technology and two balanced amplifiers used Above-IC technology. Two amplifiers were fabricated by standard CMOS technology. One focus on K band, which is 17GHz~28GHz.The other one focus on 26.6GHz to 33.6GHz, which is across K and Ka band. The simulation results show good performance on gain and bandwidth. For the former one, simulation results show the gain of 24~25dB from 17.5GHz to 28GHz. For the latter one, simulation results show the gain of 17dB from 26.6GHz to 33.6GHz.The folded Lange couplers used in these two balanced amplifiers can effectively reduce the length of ordinary Lange coupler. The measurement results were also included. In modern IC technology, large part of area could be consumed by passive devices, leading to huge cost. In Above-IC technology, the passive devices are made on the upper layer of the active devices. In the latter part of this work, Lange couplers fabricated by Above-IC technology were presented. From measurement results, the Lange coupler designed at 20~40GHz shows good coupling factor of -4dB. By using measurement data of the Lange couplers by Above-IC technology, two balanced amplifiers with improved structure designed at K/Ka band were presented. One shows the gain of 20dB from 19.1GHz to 27.1GHz. And the other one shows the gain of 18.5dB from 24.2GHz to 32.2GHz.