RF Power Amplifier Efficiency Enhancement by Envelope Injection and Termination for Mobile Terminal Applications

An improved technique to enhance the efficiency of the linear RF power amplifiers (PAs) used in mobile terminal applications is proposed. The baseband load impedance is optimized, and the input envelope, along with the RF signal, is fed to the PA input. The resulting baseband modulation of the drain...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2013-02, Vol.61 (2), p.878-889
Main Authors: Kheirkhahi, A., Yan, J. J., Asbeck, P. M., Larson, L. E.
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Baseband
Channels
Circuit properties
Dual-resonance network
efficiency enhancement
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
envelope injection
Envelopes
Exact sciences and technology
Gallium arsenide
Gallium arsenides
handset
Intermodulation distortion
Linearity
Power amplifiers
Power consumption
Power generation
predistortion
Radio frequencies
Radio frequency
Resonant frequency
RF power amplifier (PA)
self envelope tracking
Terminals
Transistors
uplink WCDMA
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Summary:An improved technique to enhance the efficiency of the linear RF power amplifiers (PAs) used in mobile terminal applications is proposed. The baseband load impedance is optimized, and the input envelope, along with the RF signal, is fed to the PA input. The resulting baseband modulation of the drain increases the saturated RF output power for a given dc power consumption. Digital predistortion is implemented to compensate for the linearity degradation. A 1.95-GHz heterojunction GaAs field-effect transistor PA, which in typical bias condition draws 100 mA from an 8.0-V supply and provides maximum power of 28 dBm for a continuous-wave input at 1.95 GHz, exhibits a significant improvement in peak power-added efficiency from 40% to 56% for a two-tone input, from 33% to 42% for an uplink WCDMA with one dedicated physical data channel (DPDCH), and from 27% to 32% for an uplink WCDMA with six DPDCHs.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2012.2234475