Title :
A single-chip variable supply voltage power amplifier
Author :
Rippke, Ian A. ; Duster, Jon S. ; Kornegay, Kevin T.
Author_Institution :
Cornell Univ., Ithaca, NY, USA
Abstract :
A single-chip implementation of a variable supply voltage power amplifier (PA) is presented. The circuit is design in SiGe BiCMOS technology and is composed of a differential power amplifier designed for WCDMA operation and a "buck" DC-DC converter. The combined system varies the supply voltage of the PA from 2.7 V to 1.2 V and maintains system linearity while the output power is not at its maximum. The system achieves an average battery current reduction of 30% and an average efficiency improvement of 46% compared to a fixed supply voltage approach, while occupying a 2 mm × 2.5 mm die area.
Keywords :
BiCMOS analogue integrated circuits; DC-DC power convertors; Ge-Si alloys; code division multiple access; differential amplifiers; electric current; electric potential; integrated circuit design; linearisation techniques; power amplifiers; radiofrequency integrated circuits; 2 mm; 2.5 mm; 2.7 to 1.2 V; SiGe; WCDMA; battery current reduction; buck DC-DC converter; buck converter; differential power amplifier; efficiency improvement; linearity; silicon-germanium BiCMOS technology; single-chip variable supply voltage power amplifier; BiCMOS integrated circuits; DC-DC power converters; Differential amplifiers; Germanium silicon alloys; Multiaccess communication; Operational amplifiers; Power amplifiers; Power supplies; Silicon germanium; Voltage;
Conference_Titel :
Radio Frequency integrated Circuits (RFIC) Symposium, 2005. Digest of Papers. 2005 IEEE
Print_ISBN :
0-7803-8983-2
DOI :
10.1109/RFIC.2005.1489776
