DocumentCode
2214206
Title
Variable-Load Constant-Efficiency Power Amplifier for Mobile Communications Applications
Author
Leuzzi, G. ; Micheli, C.
Author_Institution
Dept. Electrical Engineering, University of L´´Aquila; Monteluco di Roio, L´´Aquila 67040, Italy - leuzzi@ing.univaq.it
fYear
2003
fDate
Oct. 2003
Firstpage
375
Lastpage
377
Abstract
A SiGe HBT Class-B power amplifier has been developed with a voltage-controlled variable load, for constant efficiency also at low power levels. The output matching network includes varactor diodes that can change the load impedance at the collector of the transistor. The load line can therefore be adjusted to provide a variable output power saturation level, shifting the peak of the efficiency to the desired power level. Constant efficiency over a wide output power range is obtained. This amplifier minimises power consumption for variable output power applications, as required in mobile communications systems.
Keywords
Diodes; Germanium silicon alloys; Heterojunction bipolar transistors; Impedance matching; Mobile communication; Power amplifiers; Power generation; Silicon germanium; Varactors; Voltage;
fLanguage
English
Publisher
ieee
Conference_Titel
Microwave Conference, 2003 33rd European
Conference_Location
Munich, Germany
Print_ISBN
1-58053-834-7
Type
conf
DOI
10.1109/EUMA.2003.340968
Filename
4143032
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