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49. 有一雙極性接面電晶體(BJT),β = 100,已知室溫下熱電壓 VT = 25 mV,若 IC = 0.5 mA,試求該 BJT 之 gm 為何? (A) 20 mA⁄V(B) 40 mA⁄
問題詳情
49. 有一雙極性接面電晶體(BJT),β = 100,已知室溫下熱電壓 VT = 25 mV,若 IC = 0.5 mA,試求該 BJT 之 gm 為何?
(A) 20 mA⁄ V
(B) 40 mA⁄ V⁄
(C) 60 mA⁄ V
(D) 80 mA⁄V
參考答案
答案:A
統計:A:3,B:2,C:0,D:0,E:0
難度:計算中
上一篇 :
48. 有關功率放大器的特性分成 A 類、B 類、AB 類及 C 類,下列敘述何者有誤? (A) A 類放大器的工作操作點定於負載線中點 (B) B 類放大器的失真程度最小 (C) AB 類放大器的工
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50. 有關振盪器之敘述,下列何者有誤? (A)石英振盪器是利用晶體本身之壓電效應 (B)一般 RC 相移振盪器所產生的輸出波形為三角波 (C)射頻振盪器一般採用 LC 電路 (D)低頻振盪器一般採用
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