Download - 電子學103-Chapter5 BJT電晶體
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物理系光電組⼆二年級 電⼦子學
授課⽼老師:輔仁⼤大學物理系 副教授 張敏娟
單元七 BJT電晶體
2015 spring
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物理系光電組⼆二年級 電⼦子學
BJT電晶體
單元七 BJT電晶體
基本原理
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把N型和P型半導體,再組合,變成電晶體。BJT電晶體
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BJT電晶體
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是一個把訊號放大的元件
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三端元件
BJT電晶體
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NPN型
PNP型
BJT有兩種組成
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NPN型
N型半導體+P型半導體+N型半導體
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PNP型
P型半導體+N型半導體+P型半導體
P
nP
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BJT的全名:雙極接⾯面電晶體(Bipolar Junction Transistor)
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以電⼦子為主要載⼦子
以電洞為主要載⼦子
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基極、集極、射極BJT電晶體
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基極
BJT三端的名稱(NPN型)
+
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BJT三端的名稱(NPN型)
集極
基極+
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集極
射極
基極
BJT三端的名稱(NPN型)
+
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集極
射極
基極
載子濃度低
載子濃度高
很薄一層
BJT三端的名稱(NPN型)
+
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集極
射極
基極
收集載子
放射載子
載子容易穿越
箭頭
BJT三端的名稱(NPN型)
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載子濃度低
載子濃度高
很薄一層
以電⼦子為主要載⼦子
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BJT三端的名稱(PNP型)
集極
射極
基極
p
np+
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BJT三端的名稱(PNP型)
集極
射極
基極
p
np+
載子濃度低
載子濃度高
很薄一層
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BJT三端的名稱(PNP型)
集極
射極
基極
p
np+
載子濃度低
載子濃度高
很薄一層
收集載子
放射載子
載子容易穿越
箭頭 以電洞為主要載⼦子
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選擇題:請問NPN型BJT電晶體,主要載⼦子是?
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選擇題:請問PNP型BJT電晶體,主要載⼦子是?
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問答題:BJT電晶體三個腳位的名稱是?(請寫下中⽂文與英⽂文)
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選擇題:請問BJT電晶體,哪⼀一極的載⼦子濃度⾼高?(有標⽰示箭頭)
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問答題:請問BJT電晶體的基極為何要設計的特別薄?
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施以正確的直流偏壓,才能放⼤大電流訊號BJT電晶體
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BJT的直流偏壓(NPN型)
集極
射極
基極+
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集極
射極
基極+
BJT的直流偏壓(NPN型)
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集極
射極
基極+
BJT的直流偏壓(NPN型)
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集極
射極
基極+
BJT的直流偏壓(NPN型)
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集極
射極
基極
這樣才會進入電流放大模式
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BJT的直流偏壓(NPN型)
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BJT內部載子移動(NPN型)31
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集極
射極
基極
pn
VEC
++
+
-
-
-
VEB
VBC
BJT的直流偏壓(PNP型)
p+
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集極
射極
基極
pn
VEC
++
+
-
-
-
VEB
VBC
BJT的直流偏壓(PNP型)
p+
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集極
射極
基極
pn
VEC
++
+
-
-
-
VEB
VBC
BJT的直流偏壓(PNP型)
p+
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集極
射極
基極
pn
VEC
++
+
-
-
-
VEB
VBC
BJT的直流偏壓(PNP型)
p+
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集極
射極
基極
pn
VEC
++
+
-
-
-
VEB
VBC
BJT的直流偏壓(PNP型)
p+
這樣才會進入電流放大模式
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BJT電晶體NPN型與PNP型的直流偏壓37
EBC
BE
IC
ICIE
IE
IBIB CVBE
VEB
VCE VEC
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問答題:要讓NPN型BJT電晶體進⼊入直流偏壓的電流放⼤大模式,需要讓CB, BE, 和CE的電位如何?
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問答題:要讓PNP型BJT電晶體進⼊入直流偏壓的電流放⼤大模式,需要讓BC, EB, 和EC的電位如何?
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問答題:NPN型BJT電晶體,在施加適當直流偏壓後,進⼊入電流放⼤大模式,請問,電洞流為什麼從B極往E極流過去?
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問答題:NPN型BJT電晶體,在施加適當直流偏壓後,進⼊入電流放⼤大模式,請問,電⼦子流為什麼從E極往C極流過去?
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問答題:NPN型BJT電晶體的射極箭頭朝向內還是朝向外?PNP型BJT電晶體的射極箭頭朝向內還是朝向外?
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遵守KCL&KVLBJT電晶體
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BJT電晶體電流電壓關係
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+
- +
-
IE IBIC
IE = IB + IC ………(KCL) !
VEC = VEB + VBC ……… (KVL)
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BJT電晶體電流電壓關係
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+
- +
-
IE IBIC
IE = IB + IC ………(KCL)
!VCE = VCB + VBE ……… (KVL)
ICIBIE
IE = IB + IC ………(KCL)
!VEC = VEB + VBC ……… (KVL)
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⼤大訊號模型與⼩小訊號模型BJT電晶體
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NPN BJT大訊號模型(直流電)
IN (small)
OUT (large)
二極體順向偏壓,順向電流
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NPN BJT大訊號模型(直流電)
IN (small)
OUT (large)
電壓控制電流源
IC=βIB
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NPN BJT大訊號模型 IV特性曲線圖
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NPN BJT大訊號模型 IV特性曲線圖
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Early效應
NPN BJT大訊號模型 IV特性曲線圖
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Early效應(直流電公式修正)
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NPN BJT小訊號模型(交流電)
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Early效應
NPN BJT小訊號模型(交流電)
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計算題:⼤大訊號模型
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Example 1
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Example 1
提⽰示:VT=26mV
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1.685mA
Example 1
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Example 1
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問答題:Example1的答案IC=?62
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Example 2
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• For a bipolar transistor, IS= 5x10-17 A and β=100 . Construct the IC-VBE, IC-VCE, IB-VBE, and IB-VCE characteristics.
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Example 2
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• For a bipolar transistor, IS= 5x10-17 A and β=100 . Construct the IC-VBE, IC-VCE, IB-VBE, and IB-VCE characteristics.
提⽰示:VT=26mV
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Example 2
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• For a bipolar transistor, IS= 5x10-17 A and β=100 . Construct the IC-VBE, IC-VCE, IB-VBE, and IB-VCE characteristics.
提⽰示: 先算出三個點,VBE=700mV, 750mV, 800mV時的ICVT=26mV
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1
Example 2
• For a bipolar transistor, IS= 5x10-17 A and β=100 . Construct the IC-VBE, IC-VCE, IB-VBE, and IB-VCE characteristics.
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2
Example 2
• For a bipolar transistor, IS= 5x10-17 A and β=100 . Construct the IC-VBE, IC-VCE, IB-VBE, and IB-VCE characteristics.
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3
Example 2
• For a bipolar transistor, IS= 5x10-17 A and β=100 . Construct the IC-VBE, IC-VCE, IB-VBE, and IB-VCE characteristics.
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• For a bipolar transistor, IS= 5x10-17 A and β=100 . Construct the IC-VBE, IC-VCE, IB-VBE, and IB-VCE characteristics.
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(24.6, 700) (169, 750) (1153,800)
Example 2
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• For a bipolar transistor, IS= 5x10-17 A and β=100 . Construct the IC-VBE, IC-VCE, IB-VBE, and IB-VCE characteristics.
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(24.6, 700) (169, 750) (1153,800)
Example 2
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• For a bipolar transistor, IS= 5x10-17 A and β=100 . Construct the IC-VBE, IC-VCE, IB-VBE, and IB-VCE characteristics.
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1.69(0.246, 700) (1.69, 750) (11.53,800)
Example 2
0.25
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• For a bipolar transistor, IS= 5x10-17 A and β=100 . Construct the IC-VBE, IC-VCE, IB-VBE, and IB-VCE characteristics.
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1.69
(0.246, 700) (1.69, 750) (11.53,800)
Example 2
0.25
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問答題:Example2算出的三組(IC, VBE)數據?
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計算題:⼩小訊號模型
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NPN BJT小訊號模型(交流電)
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Early效應(交流電)
修正IC
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Example 3
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Example 3
提⽰示: VT=26mV
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Example 3
1
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Example 3
1
2
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Example 3
1
2
3
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問答題:Example3算出的三個答案是?(gm, rpi, r0)
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飽和模式(NPN型)BJT電晶體
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NPN BJT電晶體
順向主動模式
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NPN BJT電晶體
順向主動模式飽和模式
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NPN BJT電晶體飽和+主動+early effect
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PNP型BJT電晶體
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PNP BJT大訊號模型(直流電)
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當作二極體順向偏壓,有順向電流
IB=
PNP BJT大訊號模型(直流電)
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電壓控制電流源
IC=βIB
PNP BJT大訊號模型(直流電)
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PNP BJT電晶體飽和+主動+early effect
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VEC
VEB
VEB
VEB
VEB
VEB
VEC
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PNP BJT小訊號模型+ Early效應
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影⽚片欣賞BJT電晶體
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選擇題:請問P型半導體與N型半導體都是電中性嗎?
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選擇題:電晶體現在的⼤大⼩小⼤大約是多少奈⽶米?99
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當半導體越做越⼩小,空乏區的功能即將遇上電⼦子穿隧效應的挑戰。
!
電晶體還能繼續不斷的縮⼩小尺⼨寸嗎?!
!
⼗十年後摩爾定律即將遇上最嚴峻的考驗!
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第七單元 結束