Title :
Wideband Doherty Power Amplifier for WiMAX Application
Author :
Tabrizi, Mohammad Moghaddam ; Masoumi, Nasser
Author_Institution :
Sch. of Electron. & Comput., Univ. of Tehran, Tehran, Iran
Abstract :
In this work, an integrated Doherty power amplifier in 0.18 μm CMOS process is presented for WiMax applications at 2.5 GHz. Doherty configuration with cascode structure is adopted to achieve high efficiency and output power. The scaling and transistor size of main and peaking amplifier is iteratively determined to result optimum power splitting between main and peaking amplifiers. The uneven power splitting helps the peaking amplifier to generate enough current so that proper load modulation is achieved. The proposed power amplifier provides a maximum output power of 24 dBm and a power added efficiency (PAE) as high as 41% at 2.5 GHz operation frequency. At 1-dB compression point this PA exhibits 22 dBm of output power with 33% PAE.
Keywords :
CMOS analogue integrated circuits; UHF power amplifiers; WiMax; modulation; power dividers; power transistors; wideband amplifiers; CMOS process; Doherty configuration; WiMAX application; efficiency 33 percent; frequency 2.5 GHz; gain 1 dB; load modulation; optimum power splitting; peaking amplifier; power added efficiency; size 0.18 mum; transistor; wideband Doherty power amplifier; CMOS integrated circuits; Educational institutions; Impedance; Microwave amplifiers; Modulation; Power amplifiers; Power generation;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing (WiCOM), 2011 7th International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-6250-6
DOI :
10.1109/wicom.2011.6036653
