Abstract
Linearizing power amplifiers (PA) using digital pre-distortion (DPD) results in the use of a pre-distorted driving input signal that exhibits higher peak-to-average power ratio (PAPR). This results in a decrease in the PA efficiency which is dependent on the level of output power back-off required. This work proposes a new linearization architecture based on a new 'post-distortion' method for power amplifier (PA) nonlinearity compensation. The proposed architecture allows for PA linearization with optimal input signal drive level to avoid efficiency degradation. A pseudomorphic high electron-mobility transistor (pHEMT) dual input PA architecture is also introduced and shown to be suitable for the proposed linearization approach. In comparison to classic pre-distortion techniques, the proposed post-distortion improves the output power by 2 dB and the drain efficiency by 9% in the presence of a 20MHz LTE up-link signal.
Original language | English |
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Title of host publication | 2014 IEEE MTT-S International Microwave Symposium (IMS2014) |
Publisher | IEEE |
ISBN (Electronic) | 9781479938698 |
DOIs | |
Publication status | Published - 10 Jul 2014 |
Keywords
- LTE
- post-distortion
- power amplifier
- Pre-distortion
- stacked architecture