基于连续模FV类的VHF频段放大器设计
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摘要
文章利用CREE公司的CGH40006P,完成了VHF频段高效放大器设计,该设计不同于此频段的通常设计方法。设计中,基于连续模放大器FV模式的设计理论,在F类放大器偏置条件和基波阻抗的基础上,通过改变时域电压的波形,得到了连续模FV类模式下的阻抗条件。利用微波波形工程的方法,通过仿真,完成了放大器输出电压电流波形、动态负载线的设计控制以及对应的微波大信号特性。通过空气绕制电感、高Q射频电容及微带线,完成基波、二次谐波和三次谐波的匹配。在165MHz连续波输出情况下,放大器输出功率为39dBm,增益为26dB,功率附加效率为81%。在150MHz～200MHz、 28%的相对带宽内,最大功率为39.1dBm;在全频带内,功率附加效率大于65%,最大功率附加效率为87.9%。在-40℃～+70℃温度范围内,放大器的输出功率及功率增益差别小于0.15dB。
This paper present the design of a VHF band power amplifier. The design method is continuous class-FV mode different from the common VHF band power amplifiers. Based on Class F bias condition and fundamental impedance, the class-FV mode impedances are gotten by changing the voltage waveform equation. With microwave waveform engineering methodology, the output voltage and current waveforms are controlled, and the microwave performances are simulated. Harmonic impedances are realized by the air-coil inductor, high Q RF capacitor and microstrip stub. At a frequency of 165 MHz and CW operating condition, the amplifier achieved output power of 39 dBm with power gain of 26 dB and power-added efficiency 81%. In 28.5% relative frequency band, the maximum output power are 39.1 dBm and the maximum power-added efficiency is 87.9%. In the range -40℃～+70℃, the output power and power gain are less than 0.15 dB.
This paper present the design of a VHF band power amplifier. The design method is continuous class-FV mode different from the common VHF band power amplifiers. Based on Class F bias condition and fundamental impedance, the class-FV mode impedances are gotten by changing the voltage waveform equation. With microwave waveform engineering methodology, the output voltage and current waveforms are controlled, and the microwave performances are simulated. Harmonic impedances are realized by the air-coil inductor, high Q RF capacitor and microstrip stub. At a frequency of 165 MHz and CW operating condition, the amplifier achieved output power of 39 dBm with power gain of 26 dB and power-added efficiency 81%. In 28.5% relative frequency band, the maximum output power are 39.1 dBm and the maximum power-added efficiency is 87.9%. In the range -40℃～+70℃, the output power and power gain are less than 0.15 dB.
引文
[1] 苏璞,王程.L波段星载800W 脉冲固态放大器设计[J].空间电子技术,2017(5):65-68.
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[2] 张高磊,汪蕾.星用X频段10W功率放大器设计[J].空间电子技术,2017(3):1-13.
[3] 余广益,付松源,萧赞亮.VHF宽带E类高效率功率放大器设计[J].电子技术应用,2013,39(2):115-117.
[4] Cripps S.RF Power Amplifier for Wireless Communications[M].2nd Edition,Artech House Inc Norwood,2006:143-172.
[5] Wright P,Lees J and Benedikt J,et al.A Methodology for Realizing High Efficiency Class-J in a Linear and Broadband PA [J].IEEE Trans.on Microwave Theory and Techniques,2009,57(12):3196-3204.
[6] Carrubba V,Clarke A L,Akmal M,et al.On the Extension of the Continuous Class-F Mode Power Amplifier[J].IEEE Trans.on Microwave Theory and Techniques,2011,59(5):1294-1303.
[7] Cripps S,Tasker P J,Clarke A L,et al.On the Continuity of High Efficiency Modes in Linear RF Power Amplifiers [J].IEEE Microwave and Wireless Components Letter,2009,19(10):665-667.
[8] Carrubba V,Clarke A L,Akmal M,et al.The Continuous Class-F Mode Power Amplifier [C].Proceedings of the 5th European Microwave Integrated Circuits Conference,2010 Sep.27,432-435.
[9] Tong Renbin,He Songbai and Zhang Bohai.A Novel Topology of Matching Network for Realizing Broadband High Efficiency Continuous Class-F Power Amplifiers[C].Proceedings of the 8th European Microwave Integrated Circuits Conference,2013 Oct.6,504-507.