【简答题】某高频功率放大器工作在临界状态,已知其工作频率f=520MHz,电源电压E C =25v,集电极电压利用系数ξ=0.8,输入激励信号电压的幅度U bm =6v,回路谐振阻抗R e =50Ω,放大器的效率η C =75%。 求:(1)U cm 、I c1m 、输出功率P o 、集电极直流能源P D 及集电极功耗P C (2) 当激励电压U bm 增加时,放大器过渡到何种工作状态?当负载阻抗R e 增...
【简答题】填入一个适当的词补全对话,每空一词。 A: Hello! May I speak to Li Ming, please? B: This is Li Ming 小题1:. A: Hi, Li Ming, this is Wang Hong. Next Saturday is my mother’s birthday. I want to buy a present for her. Would y...