圖中電晶體 Q1 之 ， V，試求 =？
A V正確答案
B V
C V
D V
答案與詳解
為什麼答案是 A
正確答案。VB由左側10kΩ+10kΩ分壓得2.5V，VE = 2.5 - 0.7 = 1.8V，IC ≈ IE = 1.8/4k = 0.45mA，Vo = 5 - 0.45mA×0.1kΩ = 5 - 0.045 = 4.955V ≈ 4.95V
考點：分壓偏置BJT考點：偏壓計算錯誤考點：量測位置混淆考點：VE與Vo混淆
載入中…
正確答案。VB由左側10kΩ+10kΩ分壓得2.5V，VE = 2.5 - 0.7 = 1.8V，IC ≈ IE = 1.8/4k = 0.45mA，Vo = 5 - 0.45mA×0.1kΩ = 5 - 0.045 = 4.955V ≈ 4.95V
