Supply Modulation Of A Broadband Load Modulated Balanced Amplifier
2018 IEEE/MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM - IMS(2018)
摘要
This work presents multi-level supply modulation of a load modulated balanced amplifier (LMBA). The RF-input LMBA employs dynamic active matching for efficient operation over an octave bandwidth. Supply modulation is a natural candidate to further enhance the back-off efficiency of this broadband amplifier due to its independence on RF carrier frequency. In the ET-LMBA prototype demonstrated here, an efficient hybrid multi-level converter (power DAC) produces supply levels from 10 to 30V to modulate the drain of the balanced amplifier. Digital predistortion is used to linearize the ET-LMBA behavior at discrete steps and over frequency. This system is demonstrated at 2.1, 2.7 and 3.5 GHz with a 20-MHz, 10-dB PAPR signal showing composite efficiency improvement between 9 and 12 percentage points when supply modulation is employed, while maintaining linearity.
更多查看译文
关键词
load modulated balanced amplifier, LMBA, envelope tracking, supply modulation, power-DAC, power amplifier
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络