A GSM900/DCS1800 Dual-Band MMIC Power Amplifier Using Outside-Base/Center-Via-Hole Layout Multifinger HBT

Kazutomi MORI  Kenichiro CHOUMEI  Teruyuki SHIMURA  Tadashi TAKAGI  Yukio IKEDA  Osami ISHIDA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.11   pp.1913-1920
Publication Date: 1999/11/25
Online ISSN: 
DOI: 
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
Keyword: 
microwave,  amplifier,  efficiency,  layout,  heterojunction bipolar transistor,  multifinger,  

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Summary: 
A GSM900/DCS1800 dual-band AlGaAs/GaAs HBT (heterojunction bipolar transistor) MMIC (monolithic microwave integrated circuit) power amplifier has been developed. It includes power amplifiers for GSM900 and DCS1800, constant voltage bias circuits and a d. c. switch. In order to achieve high efficiency, the outside-base/center-via-hole layout is applied to the final-stage HBT of the MMIC amplifier. The layout can realize uniform output load impedance and thermal distribution of each HBT finger. The developed MMIC amplifier could provided output power of 34.5 dBm and power-added efficiency of 53.4% for GSM900, and output power of 32.0 dBm and power-added efficiency of 41.8% for DCS1800.