High efficiency amplifiers for 8 GHz band
High efficiency amplifiers for 8 GHz band
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适用于 8 GHz 频段的高效放大器
DOI：
10.1109/mwsym.1996.511033
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
S. Toyoda
中科院分区：
文献类型：
--
作者：
S. Toyoda
本文介绍了新设计的高效放大器。它们是在 8 GHz 频段运行的单推挽功率放大器。在单放大器中，电路第一级的 FET 产生梯形电压波形，工作角设置为 74/spl deg/。该电压在激励级被放大，功率放大由末级的功率 FET 执行。使用特性与所提出的放大器中使用的FET相同的FET，还构造了传统的A类和C类功率放大器。对三种（新型和传统）放大器在输出功率和功率附加效率方面进行了比较，证明了新型高效功率放大器的优势。工作频率在8GHz频段，A类放大器、C类放大器以及新型放大器的输出功率分别为2W、2.35W和3W。对于这些放大器，功率附加效率分别为 30%、48.5% 和 60%。还构建了高效推挽功率放大器，最大功率为7W，功率附加效率为76%。
This paper describes newly devised high efficiency amplifiers. They are single and push-pull power amplifiers operating in 8 GHz band. In the single amplifier, a trapezoidal voltage waveform is produced at a FET in the first stage of the circuit, and the operating angle is set to 74/spl deg/. This voltage is amplified in the exciting stage and the power amplification is performed by a power FET in the final stage. Using a FET whose characteristics are the same as those of the FET used in the proposed amplifier, the conventional class A and class C power amplifiers are also constructed. For the three (new and conventional) amplifiers, a comparison is made in the output power and the power added efficiency, and the predominance of a new high efficiency power amplifier is demonstrated. The operating frequency is in 8 GHz band, and the output power is 2 W, 2.35 W, and 3 W for class A and class C amplifiers, and the new amplifier, respectively. For these amplifiers, the power added efficiency is 30%, 48.5%, and 60%. A high efficiency push-pull power amplifier is also constructed, and a maximum power of 7 W and power added efficiency of 76% are obtained.