近年来微波晶体管在频率和功率方面都有很大的提高。为了改善功率管的热特性,把管子分成许多子单元,再并联起来。但多单元直接并联后,功率特性和增益都大大下降。这是由于各子晶体管的输入阻抗有差别,使得进入每个子晶体管功率不相等所致。另外,这样一来,也使晶体管的抗烧毁能力显著减弱。解决的办法是采用内匹配网络。 In recent years, microwave transistors have greatly increased in frequency and power. In order to improve the thermal characteristics of the power tube, the tube is divided into many sub-units, and then in parallel. However, when multiple units are directly connected in parallel, the power characteristics and gains are greatly reduced. This is due to the difference in the input impedances of the respective sub-transistors, resulting in unequal power entering each sub-transistor. In addition, this also significantly reduces the resistance of the transistor to burnout. The solution is to use the internal matching network.