Coherent beam combining of two fibre amplifier chains with a total power of 260 W in a compact system using the stochastic parallel gradient descent （SPGD） algorithm is demonstrated. A 150 MHz linewidth fibre laser ...Coherent beam combining of two fibre amplifier chains with a total power of 260 W in a compact system using the stochastic parallel gradient descent （SPGD） algorithm is demonstrated. A 150 MHz linewidth fibre laser is built and introduced for high-power amplification to mitigate stimulated Brillouin scattering （SBS）. Compact high-power amplifier chains are built with low power all-fibre system and high-power bulk free-optics fibre amplifiers. When the total power is about 260 W, active phase-locking of two high-power amplifiers is demonstrated using the SPGD algorithm. In closed-loop, the power in the main lobe increases 1.68 times, the visibility is increased from 0 to 0.62, and the phase residual error is less than λ/10.展开更多
Three linear CMOS power amplifiers （PAs） with high output power （more than watt-level output power） for high data-rate mobile applications are introduced. To realize watt-level output power, there are two 2.4 GHz ...Three linear CMOS power amplifiers （PAs） with high output power （more than watt-level output power） for high data-rate mobile applications are introduced. To realize watt-level output power, there are two 2.4 GHz PAs using an on-chip parallel combining transformer （PCT） and one 1.95 GHz PA using an on-chip series combining transformer （SCT） to combine output signals of multiple power stages. Furthermore, some linearization techniques including adaptive bias, diode linearizer, multi-gated transistors （MGTR） and the second harmonic control are applied in these PAs. Using the proposed power combiner, these three PAs are designed and fabricated in TSMC 0.18 μm RFCMOS process. According to the measurement results, the proposed two linear 2.4 GHz PAs achieve a gain of 33.2 dB and 34.3 dB, a maximum output power of 30.7 dBm and 29.4 dBm, with 29% and 31.3% of peak PAE, respectively. According to the simulation results, the presented linear 1.95 GHz PA achieves a gain of 37.5 dB, a maximum output power of 34.3 dBm with 36.3% of peak PAE.展开更多
在常用的微带两分支线电桥理论基础上,通过类似的奇偶模分析法对具备更宽工作频带的微带三分支线电桥进行了理论推导,得到了满足3 d B耦合条件时的各分支线特性阻抗计算公式。借助3D电磁场仿真软件HFSS,对理论计算初值进行了仿真优化,...在常用的微带两分支线电桥理论基础上,通过类似的奇偶模分析法对具备更宽工作频带的微带三分支线电桥进行了理论推导,得到了满足3 d B耦合条件时的各分支线特性阻抗计算公式。借助3D电磁场仿真软件HFSS,对理论计算初值进行了仿真优化,最终得到工作带宽可覆盖整个Ku频段（12~18 GHz）的微带三分支线3 d B电桥。采用该3 d B电桥背靠背地将2只功放管合成,在13~17 GHz频段内实现了输出功率高于35 W的宽带功率合成放大器。展开更多
基金supported by the Innovation Foundation for Graduates in National University of Defense Technology,China(Grant No.B080702)
文摘Coherent beam combining of two fibre amplifier chains with a total power of 260 W in a compact system using the stochastic parallel gradient descent （SPGD） algorithm is demonstrated. A 150 MHz linewidth fibre laser is built and introduced for high-power amplification to mitigate stimulated Brillouin scattering （SBS）. Compact high-power amplifier chains are built with low power all-fibre system and high-power bulk free-optics fibre amplifiers. When the total power is about 260 W, active phase-locking of two high-power amplifiers is demonstrated using the SPGD algorithm. In closed-loop, the power in the main lobe increases 1.68 times, the visibility is increased from 0 to 0.62, and the phase residual error is less than λ/10.
基金Project supported by the National Natural Science Foundation of China(No.61076030)
文摘Three linear CMOS power amplifiers （PAs） with high output power （more than watt-level output power） for high data-rate mobile applications are introduced. To realize watt-level output power, there are two 2.4 GHz PAs using an on-chip parallel combining transformer （PCT） and one 1.95 GHz PA using an on-chip series combining transformer （SCT） to combine output signals of multiple power stages. Furthermore, some linearization techniques including adaptive bias, diode linearizer, multi-gated transistors （MGTR） and the second harmonic control are applied in these PAs. Using the proposed power combiner, these three PAs are designed and fabricated in TSMC 0.18 μm RFCMOS process. According to the measurement results, the proposed two linear 2.4 GHz PAs achieve a gain of 33.2 dB and 34.3 dB, a maximum output power of 30.7 dBm and 29.4 dBm, with 29% and 31.3% of peak PAE, respectively. According to the simulation results, the presented linear 1.95 GHz PA achieves a gain of 37.5 dB, a maximum output power of 34.3 dBm with 36.3% of peak PAE.
文摘在常用的微带两分支线电桥理论基础上,通过类似的奇偶模分析法对具备更宽工作频带的微带三分支线电桥进行了理论推导,得到了满足3 d B耦合条件时的各分支线特性阻抗计算公式。借助3D电磁场仿真软件HFSS,对理论计算初值进行了仿真优化,最终得到工作带宽可覆盖整个Ku频段（12~18 GHz）的微带三分支线3 d B电桥。采用该3 d B电桥背靠背地将2只功放管合成,在13~17 GHz频段内实现了输出功率高于35 W的宽带功率合成放大器。
