【简答题】由4个二极管接成的桥式调幅电路如下图所示,已知图中调制信号u Ω (t)=U Ωm cos(Ωt)为小信号,载波信号u c (t)=U cm cos(ω c t)为大信号,即U cm U Ωm ,二极管在u c 的作用下工作在开关状态,即二极管导通时短路,截止时开路。试写出输出电压u O 的表达式,分析其频谱成分,说明电路能否实现调幅功能?
【简答题】Two years ago my grandmother was going to turn 75. My family discussed what was the best way to celebrate. Should we throw her a party ? Should we take her on a trip ? We remembered that she had touch...