Wideband Two-Way Hybrid Doherty Outphasing Power Amplifier
Wideband Two-Way Hybrid Doherty Outphasing Power Amplifier
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DOI：
10.1109/tmtt.2020.3019430
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发表时间：
2021-02
影响因子：
4.3
通讯作者：
Chenyu Liang;J. I. Martínez-López;P. Roblin;Yunsik Hahn;Dominic Mikrut;V. Chen
中科院分区：
文献类型：
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作者：
Chenyu Liang;J. I. Martínez-López;P. Roblin;Yunsik Hahn;Dominic Mikrut;V. Chen
研制了一种新型宽带双输入混合型Doherty out - phasing功率放大器（HDO-PA），其负载调制方案随着频率的增加而不断转换，从以前报道的具有最大平坦效率响应功率的HDO-PA模式转换为传统的Doherty PA模式。对于对称HDO-PA实现，这对应于辅助放大器的峰背基波电压比随频率线性变化从9/7到2。首先在电流源参考平面上建立了基于传输线的宽带HDO-PA样机，覆盖1.4 ghz ~ 2.5 ghz频段。宽带HDO-PA接下来在封装参考平面上通过合成维持整个频率带宽内固有负载调制行为所需的宽带合并电路来实现。采用连续波和调制信号制备了1.4 ghz至2.5 ghz宽带HDO-PA并对其进行了表征。随着频率的增加，6db回退效率在60% ~ 44%之间，最大功率在44.8 ~ 42.9 dBm之间。在1.7 GHz、峰值-平均功率比（PAPR）为6.5 dB、带宽为20 MHz的长期演化信号激励下，经过数字预失真线性化处理后，PA的平均漏极效率为50.3%，相邻通道漏功率比（ACLR）为- 32.0 dBc，平均漏极效率为47.8%，ACLR为- 54.0 dBc。
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.