Improving Power Amplifier Efficiency and Linearity Using a Dynamically Controlled Tunable Matching Network

Improving Power Amplifier Efficiency and Linearity Using a Dynamically Controlled Tunable Matching Network

This paper presents a tunable matching network that enhances both efficiency and linearity of power amplifiers (PAs). A medium-power amplifier with a varactor-based matching network is designed, fabricated, and tested. It is demonstrated that not only the power efficiency at reduced drive levels can...

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Veröffentlicht in:IEEE transactions on microwave theory and techniques 2008-12, Vol.56 (12), p.3239-3244
Hauptverfasser: Jia-Shiang Fu, Mortazawi, A.
Format: Artikel
Sprache:eng
Schlagworte:
Amplifiers
Applied sciences
Circuit properties
Complexity theory
Distortion
Drains
Drives
Efficiency
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Energy consumption
Equipments and installations
Exact sciences and technology
Impedance matching
Linearity
Matching
Microwaves
Mobile radiocommunication systems
Multiaccess communication
Networks
Power amplifiers
power amplifiers (PAs)
Power efficiency
Radiocommunications
Telecommunications
Telecommunications and information theory
Testing
Tunable circuits and devices
tunable matching networks
Varactors
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Beschreibung
Zusammenfassung:This paper presents a tunable matching network that enhances both efficiency and linearity of power amplifiers (PAs). A medium-power amplifier with a varactor-based matching network is designed, fabricated, and tested. It is demonstrated that not only the power efficiency at reduced drive levels can be improved but also the AM-AM and AM-PM distortions of the PA are reduced when the tunable matching network is biased according to the input drive level. Moreover, under 3GPP WCDMA modulated input, the PA with a dynamically controlled tunable matching network achieves up to 5% improvement in drain efficiency when compared with a PA employing a fixed matching network.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2008.2007094