基于GaN 的3. 4~ 3. 6 GHz 高增益Doherty 功率放大器

基于两级功率放大器架构,设计了一款平均输出功率为37 dBm(5 W)的高增益Doherty 功率放大器。 该器件通过增加前级驱动功率放大器提高Doherty 功率放大器的增益,采用反向Doherty 功率放大器架构,将λ/4 波 长传输线放置在辅助功放后端,相位补偿线放置在主功放前端,并使主功放输出匹配网络采用双阻抗匹配技术实现 阻抗变换,如此可扩宽功率放大器的工作带宽。连续波测试结果显示:3. 4~3. 6 GHz 工作频段内,饱和输出功率在 44. 5 dBm 以上,功率饱和工作点PAE 在43. 9%以上;在平均输出功率(37 dBm,5 W)工作点,回退量大于7. 5 dB,功 率附加效率PAE 为36. 8%以上,功率增益在31 dB 以上。

3. 4-3. 6 GHz High Gain Doherty Power Amplifier Based on GaN

Based on the two-stage power amplifier architecture, a high gain Doherty power amplifier with an average output power of 37 dBm (5 W) is designed in this paper. The high gain Doherty power amplifier improves the gain of Doherty power amplifier by adding the front driving power amplifier. The architecture of Inverted Doherty Power Amplifier (IDPA) is adopted to widen the working bandwidth of the traditional Doherty power amplifier. The results of continuous wave test show that the saturated output power and power added efficiency (PAE) of the designed amplifier in this paper are above 44. 5 dBm and 43. 9% respectively at the saturation output power operating point in the 3. 4-3. 6 GHz working frequency band. At the average output power (37 dBm, 5 W) operating point, the backoff of the designed amplifier in this paper is more than 7. 5 dB, the additional power efficiency (PAE) is more than 36. 8%, and the power gain is more than 31 dB.