Wideband Two-Way Hybrid Doherty Outphasing Power Amplifier

A new type of wideband dual-input hybrid Doherty outphasing power amplifier (HDO-PA) is developed in which the load-modulation scheme continuously converts as the frequency increase, from the previously reported HDO-PA mode with maximum flat efficiency response versus power to the conventional Doher...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2021-02, Vol.69 (2), p.1415-1428
Main Authors: Liang, Chenyu, Martinez-Lopez, Jose I., Roblin, Patrick, Hahn, Yunsik, Mikrut, Dominic, Chen, Vanessa
Format: Article
Language:English
Subjects:
Bandwidths
Broadband
Circuits
Continuous radiation
Current sources
Doherty power amplifiers (DPA)
Efficiency
Energy conversion efficiency
Frequencies
Frequency modulation
Hybrid power systems
Maximum power
Modulation
outphasing power amplifiers (OPA)
Peak to average power ratio
Power amplifiers
Transmission lines
Wideband
wideband power amplifiers
Wireless communication
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Summary:A new type of wideband dual-input hybrid Doherty outphasing power amplifier (HDO-PA) is developed in which the load-modulation scheme continuously converts as the frequency increase, from the previously reported HDO-PA mode with maximum flat efficiency response versus power to the conventional Doherty PA mode. For a symmetric HDO-PA implementation, this corresponds to the peak-to-backoff fundamental voltage ratio of the auxiliary amplifier linearly varying from 9/7 to 2 with frequency. A transmission-line-based wideband HDO-PA prototype is first established at the current-source reference planes to cover the frequency band from 1.4-GHz to 2.5-GHz. The wideband HDO-PA is implemented next at the package reference planes by synthesizing the wideband combiner circuit required to sustain the intrinsic load-modulation behavior across the entire frequency bandwidth. A 1.4-GHz to 2.5-GHz wideband HDO-PA is fabricated and characterized using both continuous-wave and modulated signals. The 6-dB backoff efficiency varies from 60% to 44% and the maximum power from 44.8 dBm to 42.9 dBm as the frequency increases. When the PA is excited with a 20 MHz bandwidth long-term evolution signal at 1.7 GHz with 6.5 dB peak-to-average-power ratio (PAPR), the PA achieves an average drain efficiency of 50.3% with −32.0 dBc adjacent-channel-power leakage ratio (ACLR) and an average drain efficiency of 47.8% with −54.0 dBc ACLR after digital predistortion linearization.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2020.3019430