基于ADS的L频段160 W高效功放的设计与实现

Design and Implementation of an L-band 160 W High-efficiency Amplifier Based on ADS

针对L频段连续波固态高效功放,对其电路设计仿真、实际电路调试实现的方法进行了介绍。输出功率达160 W,50 MHz带宽内效率达54.2%~61.4%,使用集成在一个基板上的2个参数高度一致的LDMOS硅功率管进行功率合成,具有窄带效率高、体积小和同相的特点。使用ADS软件对功放管模型进行了负载牵引,找到最佳的功率和效率平衡点,初步确定Load和Source的阻抗值。通过史密斯圆图工具设计相应的共轭匹配电路,用谐波平衡法进行仿真分析,通过调谐和优化相结合的方法最终确定功放管最佳的Load和Source的阻抗值。实际电路调试实现过程采取更改电容的容值和位置、改变微带线的尺寸等方法,实现了非常接近仿真的技术指标。验证结果表明,该方法可靠高效、通用性强,可广泛应用。

For L-band CW high-efficiency solid state power amplifier,the circuit design simulation and the method of the actual circuit debugging implementation are introduced.The output power is 160 W,and the efficiency is as high as 54.2%~61.4%within 50 MHz bandwidth.Two LDMOS silicon power transistors with highly consistent parameters are integrated on a substrate to realize power synthesis,which features high narrow band efficiency,small volume and same phase.ADS software is used for load pull of power amplifier tube model,the best balance between power and efficiency is found,and the impedance values of the Load and the Source are preliminary determined.The corresponding conjugate matching circuit is designed through the Smith chart tool,the method of harmonic balance is used for simulation analysis,and the best Load and Source impedance values of the amplifier tube are finally determined by a combination of tuning and optimization.In the actual circuit debugging process,specifications very close to the simulation are achieved by changing the capacitance capacity value and location as well as changing the size of the microstrip line.The verification results show that the method is reliable,efficient and versatile,and can be widely used.