功放输出功率、电压、电流和阻抗的计算

RF Amplifier Output Power,Voltage,Current and Impedance Calculation

在电磁兼容抗扰度测试应用中,通常总是存在负载阻抗失配的问题。此时,放大器设计需要采取适当的保护措施,使得放大器可以承受高驻波比的工作条件,同时输出需要的功率。在这种实际工况下,应用欧姆定律和最大功率法则计算功放输出功率、电压和电流的前提是要考虑放大器的保护措施对功率的影响、负载失配时输出功率的反射。

For application characterized by high load VSWR such as EMC immunity testing,amplifier design should apply proper protection circuitry to withstand high reflection and deliver the required power.For this real circumstance,considering of the effect of the protection circuitry and load mismatch should be taken before applying Ohm＇s Law and Maximum Power Theorem to calculate the amplifier output power,voltage and current.