Envelope tracking of a radio frequency amplifier for Long Term Evolution using a three-level class-G modulator
Envelope tracking of a radio frequency amplifier for Long Term Evolution using a three-level class-G modulator
复制标题
使用三级 G 类调制器进行长期演进的射频放大器的包络跟踪
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
M. Berroth
中科院分区：
文献类型：
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作者：
A. Brackle;L. Rathgeber;F. Siegert;S. Heck;M. Berroth
抽象的。在这篇文章中，研究了使用包络跟踪的用于长期演进（LTE）基站的射频（RF）功率放大器（PA）的效率增强。动态适应的漏极偏置电压由三电平G类调制器提供。该偏置调制器的潜力通过采用氮化镓（GaN）技术构建的AB类PA得以证明，其工作频率为2.75 GHz，最大输出功率为41 dBm，峰值功率附加效率（PAE）为60%。当由带宽为20 MHz的LTE信号驱动时，整体系统效率可以从恒定电源电压的17%提高到包络跟踪的29%。这伴随着线性度的降低。相邻信道泄漏比（ACLR）在第一和第二相邻信道中分别降低10dB和18dB。误差矢量幅度（EVM）从9%增加到29%。
Abstract. In this contribution, efficiency enhancement of a radio frequency (RF) power amplifier (PA) for Long Term Evolution (LTE) base stations using envelope tracking is investigated. The dynamically adapted drain bias voltage is provided by a three-level class-G modulator. The potential of this bias modulator is demonstrated with a class AB PA built in gallium nitride (GaN) technology with an operation frequency of 2.75 GHz, a maximum output power of 41 dBm and a peak power-added efficiency (PAE) of 60%. When driven by an LTE signal with a bandwidth of 20 MHz, overall system efficiency can be increased from 17% with a constant supply voltage up to 29% with envelope tracking. This is accompanied by a reduction of linearity. Adjacent channel leakage ratio (ACLR) decreases by 10 dB in the first and by 18 dB in the second adjacent channel, respectively. Error vector magnitude (EVM) increases from 9% up to 29%.