High-Efficiency 0.1 cc Power Amplifier Module for 900 MHz Personal Digital Cellular Telephones

Akira INOUE  Akira OHTA  Takahiro NAKAMOTO  Shigeki KAGEYAMA  Toshiaki KITANO  Hideaki KATAYAMA  Toshikazu OGATA  Noriyuki TANINO  Kazunao SATO  

IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.11   pp.1906-1912
Publication Date: 1999/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on High-Frequency/High-Speed Devices for Information and Communication Systems in the 21st Century)
Category: RF Power Devices
microwave power amplifier,  microwave power transistor,  power efficiency,  

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A new harmonic termination that controls the waveform of the drain current to be rectangular is developed for high-efficiency power amplifier modules. Its harmonic termination is a short circuit at the third harmonic and a non-short circuit at the second harmonic. It is found experimentally and confirmed by simulation that the load-matching condition at the third-order harmonic improves the efficiency of a transistor by more than 13%. By using this tuning, 57.7% power-added efficiency of the module is achieved at the output power of 29.9 dBm with ACP of -50 dBc, NACP of -65 dBc at 925 MHz and Vdd of 3.5 V.