High efficiency envelope tracking supply voltage modulator for high power base station amplifier applications

2010 IEEE MTT-S International Microwave Symposium Pub Date : 2010-05-23 DOI:10.1109/MWSYM.2010.5515693

Timo Aitto-oja

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引用次数: 21

Abstract

Wideband supply voltage modulator with efficiency of 85.1% at 120 W average output power with 7.5dB PAPR (Peak to average power ratio) (WCDMA, LTE, MC-GSM signals), and 91.7% at 130W output power with 0dB PAPR (GSM applications), was built. Supply voltage modulator consists of a linear amplifier and a switching stage in parallel. The linear amplifier is controlled by an envelope signal, and a novel method for controlling the switching stage is presented, resulting in high efficiency and low sensitivity to component variations. Over 20%-unit efficiency improvement in back-off was achieved with the new control method. The measured efficiency was above 80% over 14dB average power range with 7.5dB PAPR test signal. Demonstrator circuit was built from discrete commercial components. An ET PA implemented with demonstrator modulator exhibited -60dBc ACP linearity with dual carrier 7.5dB PAPR WCDMA signal. For more wideband and compact ET PA implementation integrated circuit (IC) was fabricated and ET PA implemented with the IC modulator achieved -58dBc ACP linearity with quad carrier 7.5dB PAPR WCDMA signal. Wideband operation required special design for PA supply feed line design.

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用于高功率基站放大器的高效率包络跟踪电源电压调制器

构建的宽带电源调制器在WCDMA、LTE、MC-GSM信号中，平均输出功率为120 W、峰值平均功率比为7.5dB时效率为85.1%，在GSM信号中，平均输出功率为130W、峰值平均功率比为0dB时效率为91.7%。电源电压调制器由一个线性放大器和一个并联的开关级组成。采用包络信号控制线性放大器，提出了一种控制开关级的新方法，提高了开关级的控制效率，降低了开关级对元件变化的灵敏度。采用该控制方法后，机组回退效率提高20%以上。在14dB的平均功率范围内，在7.5dB的PAPR测试信号下，测量效率在80%以上。演示电路由分立的商业元件构建而成。用演示调制器实现的ET放大器具有-60dBc ACP线性度，双载波7.5dB PAPR WCDMA信号。为了实现更宽带和更紧凑的ET PA实现，制作了集成电路(IC)，并使用IC调制器实现了ET PA在四载波7.5dB PAPR WCDMA信号下-58dBc ACP线性度。宽带操作需要特殊设计的PA供电馈线设计。

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2010 IEEE MTT-S International Microwave Symposium

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