A 25 dBm Outphasing Power Amplifier With Cross-Bridge Combiners
A 25 dBm Outphasing Power Amplifier With Cross-Bridge Combiners
复制标题
具有跨桥组合器的 25 dBm 异相功率放大器
DOI：
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发表时间：
2015
影响因子：
5.4
通讯作者：
B. Haroun
中科院分区：
文献类型：
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作者：
Lei Ding;Joonhoi Hur;A. Banerjee;R. Hezar;B. Haroun
本文提出了一种25 dBm的D类异相功率放大器。D类PA采用标准45 nm工艺设计，而组合器采用集总元件在板上实现，以实现测试灵活性。与传统的非隔离型合路器相比，交叉桥合路器的元件被仔细地选择，使得形成附加的谐振网络以减少异相电流，从而提高异相PA的回退效率。在900 MHz和2.4 GHz下制造并测量了具有建议组合器的D类异相PA。对于单音输入，它在900 MHz和2.4 GHz时分别实现55%和45%的峰值功率附加效率（PAE）。对于具有6 dB PAR的10 MHz LTE信号，PAE在900 MHz和-39 dBc邻道功率比（ACPR）下为32%，在2.4 GHz和-33 dBc ACPR下为22%。借助数字预失真（DPD），PA在2.4 GHz时的线性度进一步提高，对于10 MHz、20 MHz和2载波20 MHz LTE信号，ACPR分别达到-53 dBc、-50 dBc和-42 dBc。
In this paper, we present a 25 dBm Class-D outphasing power amplifier (PA) with cross-bridge combiners. The Class-D PA is designed in a standard 45 nm process while the combiner is implemented on board using lumped elements for flexibilities in testing. Comparing with conventional non-isolated combiners, the elements of the cross-bridge combiner are carefully chosen so that additional resonance network is formed to reduce out-of-phase current, thereby increasing backoff efficiency of the outphasing PA. The Class-D outphasing PA with the proposed combiner is manufactured and measured at both 900 MHz and 2.4 GHz. It achieves 55% peak power-added efficiency (PAE) at 900 MHz and 45% at 2.4 GHz for a single tone input. For a 10 MHz LTE signal with 6 dB PAR, the PAE is 32% at 900 MHz with -39 dBc adjacent channel power ratio (ACPR) and 22% at 2.4 GHz with -33 dBc ACPR. With digital predistortion (DPD), the linearity of the PA at 2.4 GHz is improved further to reach -53 dBc, -50 dBc, -42 dBc ACPR for 10 MHz, 20 MHz, and 2-carrier 20 MHz LTE signals.