An 60 W average power wideband amplifier with envelope tracking for DVB-T applications

An 60 W average power wideband amplifier with envelope tracking for DVB-T applications
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适用于 DVB-T 应用的具有包络跟踪功能的 60 W 平均功率宽带放大器

DOI:
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发表时间:
2016
期刊:
European Microwave Conference
影响因子:
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通讯作者:
G. Boeck
G. Boeck
中科院分区:
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文献类型:
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作者:
D. Maassen;L. Schenk;Martin Muessener;Peter Muehlbacher;Uwe Dalisda;G. Boeck

文献摘要

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本文描述了基于包络跟踪方法 (ET) 的具有增强效率性能的 DVB-T 功率放大器 (PA) 的开发。该放大器工作在 470 至 803 MHz 的超高频 (UHF) 频段。 PA 由横向扩散金属氧化物半导体 (LDMOS) 的两个耦合推挽级组成,它们组合在一起并配备多级电源调制器以实现漏极调制。结果表明,8 MHz 编码正交频分复用 (COFDM) 的漏极效率提高了 14.6 %,高达 η ≥ 42 % — 信号峰均功率比 (PAPR) 为 9 dB,包括电源调制器的损耗。在满足频谱模板的同时,在 470–803 MHz 频率范围内,输出功率高于 60 W(峰值 470 W)。
In this paper, the development of a DVB-T power amplifier (PA) with enhanced efficiency performance based on the envelope tracking method (ET) is described. The amplifier works in the ultrahigh frequency (UHF) band from 470 to 803 MHz. The PA consists of two coupled push-pull stages of laterally diffused metal oxide semiconductors (LDMOS) that are combined and equipped with a multilevel Supply Modulator to achieve a drain modulation. The results indicate an improved drain efficiency within 14.6 % up to η ≥ 42 % for a 8 MHz coded orthogonal frequency division multiplexing (COFDM) — signal with 9 dB peak-to-average power ratio (PAPR) including the losses of the Supply Modulator. While fulfilling the spectrum mask, the output power is higher than 60 W (470 W peak) for the frequency range from 470–803 MHz.