Variable-load constant efficiency power amplifier for mobile communications applications

Author

Leuzzi, G. ; Micheli, C.

Author_Institution

Dept. of Electr. Eng., L´´Aquila Univ., Italy

Volume

1

fYear

2003

fDate

7-9 Oct. 2003

Firstpage

375

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 he 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 amplifer minimises power consumption for variable output power applications as required in mobile communications systems.

Keywords

Ge-Si alloys; UHF integrated circuits; UHF power amplifiers; bipolar analogue integrated circuits; impedance matching; mobile communication; varactors; HBT Class-B power amplifier; load impedance; minimised power consumption; mobile communications applications; output matching network; power saturation level; varactor diodes; variable matching network; variable-load constant efficiency power amplifier; voltage-controlled variable load; 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

Print_ISBN

1-58053-834-7

Type

conf

DOI

10.1109/EUMC.2003.1262297

Filename

1262297