基于嵌套负载牵引技术的超宽带高效功放设计

提出了一种基于嵌套负载牵引技术的多倍频程功率放大器的设计方法。与传统的负载牵引技术不同,该方法考虑了基波阻抗与二次谐波阻抗之间的相关性,能够提供更精确的设计区域。它不仅可以研究带内谐波对功放多倍频性能的影响,而且可以改善设计空间,使宽带匹配网络设计更加方便。为验证该方法的可行性,设计并实现了一款超宽带功率放大器。实验结果表明,在0.3~3.2 GHz(相对带宽165.7%)频段内,漏极效率为61.8%~73.6%,输出功率为40.2~42.6 dBm,实现的功放面积为7.4 cm×3.0 cm,与其它性能相近功放相比,面积明显减小。

Design of a Multi-Octave High Efficient Power Amplifier Based on Nested Load-Pull Technique

A design methodology for multi-octave power amplifiers (PAs) is presented in this paper using sequential nested load-pull technique. Unlike conventional load-pull technique, the proposed method considering the correlation between the fundamental impedance and the second harmonic impedance can provide more accurate design area. And it can not only investigate the in-band harmonics influence on the multi-octave performance of the PA, but also can improve the design area making the broadband matching network design more convenient. To demonstrate the capability of this technique, an ultra-wideband PA prototype is designed and fabricated. Experimental results show that the drain efficiency is 61. 8%-73. 6% and the output power is 40. 2-42. 6 dBm across 0. 3-3. 2 GHz (relative bandwidth 165. 7%). The proposed PA obtains 7. 4 cm×3. 0 cm area, which is reduced comparing with other PAs in similar performances.