Dynamic biasing in SiGe HBT for wideband step envelope tracking power amplifiers
✍ Scribed by A. Cidronali; I. Magrini; R. Fagotti; F. Alimenti; M. Mercanti; G. Manes
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 357 KB
- Volume
- 18
- Category
- Article
- ISSN
- 1096-4290
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✦ Synopsis
This article investigates the use of reconfigurable class-AB power amplifiers in wideband step envelope tracking (SET) architectures. The experimental results are related to a SiGe-HBT power-device prototype in which a dynamic switching capability has been integrated. The SET architecture is complemented by a digital predistortion algorithm and the resulting structure (circuit plus algorithm) is analyzed at system level. As a result, the SiGe prototype is capable to provide 20 dBm total output power with EVM 5 5.1%. In the case of 802.11g and WCDMA signals the proposed approach gives a relative average PAE enhancement in excess of 46% with respect to traditional class-AB RF power amplifiers. V