Design and Analysis of a Stage-Scaled Distributed Power Amplifier
Design and Analysis of a Stage-Scaled Distributed Power Amplifier
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级级分布式功率放大器的设计与分析
DOI：
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发表时间：
2011
影响因子：
4.3
通讯作者：
A. Niknejad
中科院分区：
文献类型：
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作者：
Jiashu Chen;A. Niknejad
本文介绍了一种采用0.13 μ mSiGeBiCMOS工艺的伪差分分布式功率放大器的设计、分析和测量。为了减小由于双极基极电阻引起的大负载传输线损耗，使用了发射极负反馈，并选择了最佳小信号设计点以获得最大增益带宽积。为了提高分布式放大器（DA）的效率，提出了一种级缩放技术，以利用更多的电压摆幅，同时降低总的电流消耗。放大器的输出功率和效率作为两个缩放系数的函数进行评估。所制作的分布式功率放大器实现了10 dB的小信号增益和110 GHz的3 dB带宽。实测的中频饱和输出功率为17.5 dBm，峰值功率附加效率（PAE）为13.2%，3 dB输出功率带宽大于77 GHz。该放大器在3V电源下消耗119 mA，占地面积为2.08 mm x 1.05 mm。与采用相同工艺制造的均匀非缩放DA相比，级缩放放大器在整个测量频率范围内实现了相同的输出功率，同时具有更高的集电极效率和功率放大器效率。
This paper presents the design, analysis, and measurement of a pseudodifferential distributed power amplifier in a 0.13-μm SiGe BiCMOS process. To mitigate the large loaded transmission line loss due to bipolar base resistance, emitter degeneration is used and an optimal small-signal design point is selected for maximum gain-bandwidth product. To enhance the efficiency of distributed amplifiers (DAs), a stage-scaling technique is proposed to utilize more voltage swing while reducing the total current consumption. The output power and efficiency of the amplifier are evaluated as a function of two scaling coefficients. The fabricated distributed power amplifier achieves a small-signal gain of 10 dB and a 3-dB bandwidth of 110 GHz. The measured midband saturated output power is 17.5 dBm with a peak power-added efficiency (PAE) of 13.2% and the 3-dB output power bandwidth is greater than 77 GHz. The amplifier consumes 119 mA from a 3-V supply and occupies an area of 2.08 mm × 1.05 mm. Compared to a uniform nonscaled DA fabricated in the same process, the stage-scaled amplifier achieves the same output power with higher collector efficiency and PAE over the entire measured frequency range.