Tommaso A. Cappello, Prathamesh H. Pednekar, C. Florian, Z. Popovic, T. Barton
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引用次数: 15
摘要
本文提出了负载调制平衡放大器(LMBA)的多级电源调制。射频输入LMBA采用动态主动匹配，在一个倍频带宽内高效运行。由于其与射频载波频率无关，因此电源调制是进一步提高该宽带放大器退退效率的自然候选。在这里展示的ET-LMBA原型中，一个高效的混合多级转换器(功率DAC)产生10到30 V的电源电平来调制平衡放大器的漏极。数字预失真用于线性化离散阶跃和过频的ET-LMBA行为。该系统在2.1、2.7和3.5 GHz的20 mhz、10 db PAPR信号下进行了演示，当采用电源调制时，复合效率提高了9到12个百分点，同时保持了线性度。
Supply Modulation of a Broadband Load Modulated Balanced Amplifier
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 30 V 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.
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