Highly Efficient Power Amplifier for CDMA Base StationsWE5A-4 Highly Efficient Power Amplifier for CDMA Base Stations Using Doherty Configuration Jeonghyeon Cha1, Jangheon Kim1, Bumman Kim1, Jong Sung Lee2, and Sang Hoon Kim2 Department of Electronic and Electrical Engineering and Microwave Application Research Center, Pohang University of Science and Technology, Gyeongbuk, 790-784, Republic of Korea 2 Telecommunication R&D Center, Samsung Electronics co., LTD, Suwon, Gyeonggi, 442-742, Korea Abstract ― We have extended the classical Doherty amplifier to support CDMA base station power amplifiers that require high efficiency and good linearity. At first, we have estimated three transistors, Motorola’s MRF21085, MRF5S21090 and MRF5P21180 LDMOS’s, to confirm the suitability for Doherty operation. Since the MRF21085 transistor is not suitable, w……