Wideband Doherty Power Amplifier for WiMAX Application

Author

Tabrizi, Mohammad Moghaddam ; Masoumi, Nasser

Author_Institution

Sch. of Electron. & Comput., Univ. of Tehran, Tehran, Iran

fYear

2011

fDate

23-25 Sept. 2011

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing (WiCOM), 2011 7th International Conference on

Conference_Location

Wuhan

ISSN

2161-9646

Print_ISBN

978-1-4244-6250-6

Type

conf

DOI

10.1109/wicom.2011.6036653

Filename

6036653