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晶体管最大工作电流I_(CM)直接由大电流时h_(FB)或f_T下降的情况所决定,因此研究大电流时h_(FB)和f_T下降就成了晶体管设计与生产的重要课题,尤其是高频大功率晶体管,这个问题更为突出。
The maximum operating current I CM of a transistor is directly determined by the decrease of h FB or f T during high current. Therefore, it is an important issue for the design and manufacture of transistors to study the decrease of h FB and f T during high current. High-frequency high-power transistors, the problem is even more prominent.