作者fairwarning (一輪明月與藍夜!!)
看板Grad-ProbAsk
標題[理工] [電子]-CMOS differential stage
時間Wed Nov 18 13:12:03 2009
[電路圖]
http://www.wretch.cc/album/show.php?i=fairwarning&b=78&f=1172957211&p=9
【題目】
The circuit shown is a CMOS differential stage in which
the aspect ratio W/L is indicated in adjacent to the devices.
The NMOS devices have K=25uA/V^2,Vt=1.5V,VA=50V,
The PMOS devices have K=12.5uA/V^2,Vt=(-1.5)V,VA=100V,
Determine the bias currents in each transistor.
【ANS】
I1=I2=I3=I4=0.1mA
I5=I6=I7=0.2mA
I8=0.4mA
請問圖中的 2/I 4/I 代表什麼意思呢?是電晶體的面積比嗎?
第一次看到這種標識....不懂...
又請問電流要怎麼算呢....
先謝謝大家的解答喔...謝謝!!
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1F:推 shinyhaung:就跟你想的一樣是面積比 電流用下面的電流鏡算 11/18 13:13
2F:→ fairwarning:我是想算下面右手邊16.25k的電流..但還在找Vgs8的電壓 11/18 13:24
3F:→ fairwarning:請問該怎麼找呢? 謝謝.. 11/18 13:25
4F:→ fairwarning:就覺得少Id與Vgs.. 11/18 13:26
5F:推 shinyhaung:右下角 I=[0-Vgs-(-10)]/16.25 =K(Vgs-Vt)^2 11/18 14:34
6F:→ fairwarning:謝謝喔..!! 11/19 08:40