[题目] 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? 请问 我把上述文字变成电路图这样画对吗? http://www.wretch.cc/album/show.php?i=fairwarning&b=73&f=1071626626&p=2 又请问 a voltage gain of 100 with the output taken differentially between collector resistors of 5KΩ. 这句话的意思是Vo在Rc那两端输出(得到Av)? 请问这样翻译对吗? [我的解题过程] Ri=2rπ=10K -------> rπ=5K rπ=(1+β)re , re=Vt/IE -----> re=0.505mA 乘上2边 所以 current source = 1.01mA 又Ad(双)=gm*Rc 100 = gm * 5 又 β=gm*rπ -----> β=100 请问上述解法对吗? 在算电压增益时...不用算Acm吗?? 还请大家帮忙检查与解析.. 谢谢大家的帮忙!! 谢谢!! -- 吉他演奏曲 http://blog.xuite.net/iloveguitar/music?st=c&re=list&p=1&w=641095 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 140.127.150.126 ※ 编辑: fairwarning 来自: 140.127.150.126 (09/16 12:32)