0.35-μm SiGe BiCMOS variable-gain power amplifier for WiMAX transmitters

A 0.35‐μm SiGe BiCMOS variable‐gain power amplifier for WiMAX transmitters is presented. A voltage‐controlled variable resistor is used to control the gain of the linear amplifier. An open‐collector adaptive bias is utilized to obtain high linearity and efficiency. The measured power amplifier achie...

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Bibliographic Details
Published in:Microwave and optical technology letters 2007-11, Vol.49 (11), p.2750-2753
Main Authors: Liao, Hsien-Yuan, Chen, Kuan-Yu, Deng, Joseph D.-S., Chiou, Hwann-Kaeo
Format: Article
Language:English
Subjects:
adaptive bias
power amplifier
SiGe BiCMOS
variable gain
WiMAX
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Summary:A 0.35‐μm SiGe BiCMOS variable‐gain power amplifier for WiMAX transmitters is presented. A voltage‐controlled variable resistor is used to control the gain of the linear amplifier. An open‐collector adaptive bias is utilized to obtain high linearity and efficiency. The measured power amplifier achieves a power gain of 22.2 dB, an output power of 20.6 dBm, and a power‐added efficiency of 24.4% with 10‐dB tuning range of linear gain. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2750–2753, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22851
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.22851