A single-chip variable supply voltage power amplifier

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 vo...

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Bibliographic Details
Main Authors: Rippke, I.A., Duster, J.S., Kornegay, K.T.
Format: Conference Proceeding
Language:English
Subjects:
BiCMOS integrated circuits
DC-DC power converters
Differential amplifiers
Germanium silicon alloys
Multiaccess communication
Operational amplifiers
Power amplifiers
Power supplies
Silicon germanium
Voltage
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Description
Summary: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 /spl times/ 2.5 mm die area.
ISSN:1529-2517
2375-0995
DOI:10.1109/RFIC.2005.1489776