Lei, M.-F.M.-F.LeiTsai, Z.-M.Z.-M.TsaiKUN-YOU LINHUEI WANG2020-06-042020-06-042007https://www.scopus.com/inward/record.uri?eid=2-s2.0-36949039375&doi=10.1109%2fTMTT.2007.909147&partnerID=40&md5=1388c82f04172efc39075aa19b36569fThe stacked-device power-combining technique is a proven method to increase the output power and load impedance of a power amplifier (PA) simultaneously. The series-input configuration is physically realizable for multicell stacked device configuration in monolithic circuits. The series-input and series-output stack configuration is rigorously analyzed and proven to increase both the input impedance and output impedance simultaneously, easing the matching circuit designs in high PAs. The effects of asymmetry of the input feed and amplifier cells due to distributed effects and process variation on the performance of the stack amplifier are discussed. A four-cell HBT amplifier operating at 56 GHz is demonstrated to validate the circuit concept. © 2006 IEEE.Monolithic microwave integrated circuit (MMIC) power amplifiers (PAs); Stacked amplifier[SDGs]SDG7conference paper10.1109/TMTT.2007.9091472-s2.0-36949039375