Efficient and wideband envelope amplifiers for envelope tracking and polar transmitters
Efficient and wideband envelope amplifiers for envelope tracking and polar transmitters
复制标题
用于包络跟踪和极性发射机的高效宽带包络放大器
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
L. Larson
中科院分区：
文献类型：
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作者：
D. Kimball;J. Yan;P. Theilmanrr;M. Hassan;P. Asbeck;L. Larson
包络跟踪提供了在具有高峰均比信号（诸如OFDMA）的下一代无线发射机的功率放大器中实现高效率的可能性。具有高保真、高效率和宽带宽的包络调制器是包络跟踪广泛应用的关键。本文综述了各种应用于基站和手机功率放大器的包络放大器的发展。首先描述了电压摆幅、带宽和精度的要求。介绍了用于实现高达50 V电压的包络调制器的各种技术，这些技术可用于具有Si-LDMOS、HVHBT、GaN RF功率晶体管的基站中。还讨论了用于无线手机的CMOS基硅包络调制器集成电路。介绍了包络跟踪微波功率放大器，其在手机中实现LTE的总效率大于45%，在基站中实现效率大于64%。
Envelope tracking provides the potential for achieving high efficiency in power amplifiers for next generation wireless transmitters with high peak-to-average ratio signals such as OFDMA. Envelope modulators with high fidelity, high efficiency and wide bandwidth are critical enablers for the widespread application of envelope tracking. This presentation reviews the development of various envelope amplifiers for applications in basestation and handset power amplifiers. Requirements of voltage swing, bandwidth, and accuracy are first described. Various technologies for envelope modulators achieving voltages as high as 50V are presented, for operation in basestations with Si-LDMOS, HVHBT, GaN RF power transistors. CMOS-based Si envelope modulator ICs for operation in wireless handsets are also discussed. Envelope tracking microwave power amplifiers that achieve overall efficiency greater than 45% for LTE in handsets and greater than 64 % efficiency in basestations are presented.