VGD=VGS-VDS<VT
=>VGS-(VDD-RD*I)<VT
=> VGS-(5-3)<0.5
=>VGS<2.5
25 如圖電路為一共源放大器的簡圖,若電晶體之臨界電壓(Threshold Vo..-阿摩線上測驗