【简答题】某晶体三极管的 从20μA变化到40μA时,对应的 从2mA变化到5mA,则该管的β为多少?
【简答题】阅读下面短文,把A-D四个句子填人文中空缺处(第l一4小题),使短文内容完整正确,并完成第5小题。 请把所选答案的字母标号填写在后面各小题相应的括号内。 'We are reading the first part of a book that doesn't end...' I don't know who wrote these words. But I have always liked t...
【单选题】某晶体三极管的 iB 从 20μA 变化到 40μA 时,对应的 iC 从 2mA 变化到 5mA ,则该管的 β 等于 ( ) 。
【简答题】根据句意,用所给单词或短语的适当形式填空。 whatever, remind ... of, on display, to be honest, be in agreement 1. The latest styles of clothes from Paris, Italy and New York are _____ now. 2. Hearing that song always ____...
【简答题】图9.11所示为某晶体管的输出特性曲线,试求:U CE =10V时,(1)I B 从0.4mA变到0.8mA;从0.6mA变到0.8mA两种情况下的动态电流放大系数;(2)I B 等于0.4mA和0.8mA两种情况下的静态电流放大系数。
【单选题】某NPN晶体管共射放大电路中,当IB 从15μA增大到20μA时,IC 从2 mA变为3mA,那么这晶体管的β约为( )。