Efficient Multisignal 2–4-GHz Power Amplifier With Power Tracking
- Resource Type
- Periodical
- Authors
- Duffy, M.R.; Lasser, G.; Olavsbraten, M.; Berry, E.; Popovic, Z.
- Source
- IEEE Transactions on Microwave Theory and Techniques IEEE Trans. Microwave Theory Techn. Microwave Theory and Techniques, IEEE Transactions on. 66(12):5652-5663 Dec, 2018
- Subject
- Fields, Waves and Electromagnetics
Trajectory
Bandwidth
Modulation
Gain
Gallium nitride
Broadband communication
Harmonic analysis
Broadband
carrier aggregation
efficiency
GaN
power amplifiers (PAs)
supply modulation
- Language
- ISSN
- 0018-9480
1557-9670
The goal of the work presented in this paper is to demonstrate an efficient method of amplifying multiple concurrent signals over a large bandwidth using a supply modulation approach. A single-stage octave bandwidth (2–4 GHz) power amplifier (PA) with greater than 10-W output power and drain efficiency ranging from 48%–60% is presented. The amplifier is tested with several reduced-bandwidth supply modulation trajectories that are constructed as an even-termed power series of a 10-MHz LTE signal envelope. A greater than 30% point increase in $\eta _{D}$ is achieved while maintaining less than −45-dB ACPR with digital predistortion (DPD). Two 10-MHz LTE signals with 800-MHz spacing are then amplified using a similar bandwidth-reduction technique. A greater than 20% point increase in $\eta _{D}$ is seen with an improvement in linearity through the use of multidimensional DPD. The method presented here can be extended to more than two concurrent signals of arbitrary spacing for a PA with large RF bandwidth.