[題目] A BJT differential amplifier having the biasing circuit with current source found to have an input resistance if 10KΩ and a voltage gain of 100 with the output taken differentially between collector resistors of 5KΩ. What is the bias current for the amplifier and β for the transistor used? 請問 我把上述文字變成電路圖這樣畫對嗎? http://www.wretch.cc/album/show.php?i=fairwarning&b=73&f=1071626626&p=2 又請問 a voltage gain of 100 with the output taken differentially between collector resistors of 5KΩ. 這句話的意思是Vo在Rc那兩端輸出(得到Av)? 請問這樣翻譯對嗎? [我的解題過程] Ri=2rπ=10K -------> rπ=5K rπ=(1+β)re , re=Vt/IE -----> re=0.505mA 乘上2邊 所以 current source = 1.01mA 又Ad(雙)=gm*Rc 100 = gm * 5 又 β=gm*rπ -----> β=100 請問上述解法對嗎? 在算電壓增益時...不用算Acm嗎?? 還請大家幫忙檢查與解析.. 謝謝大家的幫忙!! 謝謝!! -- 吉他演奏曲 http://blog.xuite.net/iloveguitar/music?st=c&re=list&p=1&w=641095 --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.127.150.126 ※ 編輯: fairwarning 來自: 140.127.150.126 (09/16 12:32)