A fully integrated 2.4 GHz CMOS high power amplifier using parallel class A&B power amplifier and power-combining transformer for WiMAX application

Authors:  Ahmad Rahati Belabad, Nasser Masoumi, Shahin J. Ashtiani

Abstract:
A new structure integrated power amplifier with watt-level output power is presented in a standard 0.18 m CMOS process for WiMAX applications. A parallel cascode class A&B power amplifier with optimized widths is proposed to increase linearity and efficiency simultaneously. A novel interleaved PCT power combiner is proposed for increasing output power that combines output current of two similar class A&B power amplifiers. Proposed interleaved transformer heightens coupling factor compared to typical transformer.
    The proposed power amplifier with 3.3V power supply provides maximum output power of 32.5 dBm and power added efficiency of 37.9% at 2.4 GHz operating frequency. The proposed power amplifier exhibits high output power of 32.3 dBm at 1 dB compression point. The simulation results for proposed PA withmodulated OFDMsignal show that −31 dB error vectormagnitude atthe average power of 25 dBm can be achieved.

Keywords:
CMOS
Power amplifier (PA)
Parallel class A&B PA
Transformer
WiMAX

Published in: AEÜ-International Journal of Electronics and Communications (Volume 67, Issue 12, December  2013)

Publisher: Elsevier

ISSN Information: 1434-8411

A fully integrated 2.4 GHz CMOS high power amplifier using parallel class A&B power amplifier and power-combining transformer for WiMAX application

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