bjt bias - wikimedia · 26/05/2017 · bjt bias 10 young won lim 05/26/2017 two voltage supplies...
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![Page 1: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/1.jpg)
Young Won Lim05/26/2017
BJT Bias
![Page 2: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/2.jpg)
Young Won Lim05/26/2017
Copyright (c) 2012 – 2017 Young W. Lim.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".
Please send corrections (or suggestions) to [email protected].
This document was produced by using OpenOffice and Octave.
![Page 3: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/3.jpg)
BJT Bias 3 Young Won Lim05/26/2017
BJT Configurations
n p nE
B
C
Common Base
n p n
B
Common Base
E
B
C
Common Emitter
n
p
n
E
BC
Common Emitter
n
p
n
E
B
C
Common Collector
n
p
n
E
B
C
Common Collector
n
p
n
E C
![Page 4: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/4.jpg)
BJT Bias 4 Young Won Lim05/26/2017
Common Base
n p n
E
B
C
Current Flow
Common Base
n p n
E C
B
Current Flow
Common Base
IN OUT IN OUT
![Page 5: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/5.jpg)
BJT Bias 5 Young Won Lim05/26/2017
Common Emitter
E
B
C
Current Flow
Common Emitter
n
p
n E
B
C
Current Flow
Common Emitter
n
p
n
IN
OUT
IN
OUT
![Page 6: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/6.jpg)
BJT Bias 6 Young Won Lim05/26/2017
Common Collector
E
B
C
Current Flow
Common Collector
n
p
n
E
B
C
Current Flow
Common Collector
n
p
n
IN
OUT
IN
OUT
![Page 7: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/7.jpg)
BJT Bias 7 Young Won Lim05/26/2017
Forward bias (BE) & Reverse bias (CB)
E
B
C E
B
C
n
p
n
n
p
n
Common CollectorCommon EmitterCommon Base
n p n
E C
B
n
p
n
E
B
C
n
p
n
E
B
C
V BE
V CB
forward biasreverse bias
V BE
V CB
forward biasreverse bias
V BE
V CB
forward biasreverse bias
n p n
B
E C
![Page 8: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/8.jpg)
BJT Bias 8 Young Won Lim05/26/2017
Biasing Back-to-back Diodes
Common CollectorCommon EmitterCommon Base
n p n
E C
B
n
p
n
E
B
C
n
p
n
E
B
C
V BE
V CB
forward biasreverse bias
V BE
V CB
forward biasreverse bias
V BE
V CB
forward biasreverse bias
++ – –
+
+–
–
+
+–
–
![Page 9: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/9.jpg)
BJT Bias 9 Young Won Lim05/26/2017
Two voltage supplies
E
B
C E
B
C
n
p
n
n
p
n
Common CollectorCommon EmitterCommon Base
V BE
V CB
forward biasreverse bias
V BE
V CB
forward biasreverse bias
V BE
V CB
forward biasreverse bias
V BE V CB V BE V CE V CB V CE
n p n
B
E C
![Page 10: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/10.jpg)
BJT Bias 10 Young Won Lim05/26/2017
Two voltage supplies controls VBE & VCB
E
B
C E
B
C
n
p
n
n
p
n
Common CollectorCommon EmitterCommon Base
V BE
V CB
V BE
V CE
V CB
V CE
n p n
B
E C
Voltage of B from E
Voltage of C from B
Voltage of B from E
Voltage of C from E
Voltage of C from B
Voltage of C from E
V CB + V BE V CB + V BE
+
–
–
+
–
+
–
+
–
+
–
+
![Page 11: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/11.jpg)
BJT Bias 11 Young Won Lim05/26/2017
Two voltage supplies with resistors
n p n
B E
B
C E
B
C
n
p
n
n
p
n
++
+
+
+
+
– –
–
–
– –
Common CollectorCommon EmitterCommon Base
V BE V CB
V BE V CE V CB V CE
n p n
n
p
n
n
p
n
E C
V CB V BE
E B C
C
B
E
E
B
C
![Page 12: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/12.jpg)
BJT Bias 12 Young Won Lim05/26/2017
![Page 13: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/13.jpg)
BJT Bias 13 Young Won Lim05/26/2017
Common Base (1)
n p n
E
B
C
Common Base
n p n
E
B
C
Electron Flow Current Flow
Common Base
forward bias reverse bias forward bias reverse bias
![Page 14: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/14.jpg)
BJT Bias 14 Young Won Lim05/26/2017
Common Base (2)
n p n
E
B
C
Electron Flow
n p n
E C
n p n n p n
B
E
B
C E C
B
Current Flow
Common Base Common Base
![Page 15: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/15.jpg)
BJT Bias 15 Young Won Lim05/26/2017
Common Emitter (1)
E
B
C
E
B
C
Electron Flow Current Flow
Common Emitter Common Emitter
n
p
n
n
p
nforward bias
reverse bias
forward bias
reverse bias
![Page 16: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/16.jpg)
BJT Bias 16 Young Won Lim05/26/2017
Common Emitter (2)
E
B
C
E
B
C
Electron Flow Current Flow
Common Emitter Common Emitter
n
p
n
n
p
n
n
p
n
n
p
n
![Page 17: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/17.jpg)
BJT Bias 17 Young Won Lim05/26/2017
Common Collector (1)
E
B
C
E
B
C
Electron Flow Current Flow
Common Collector Common Collector
n
p
n
n
p
n
forward bias
reverse bias
forward bias
reverse bias
![Page 18: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/18.jpg)
BJT Bias 18 Young Won Lim05/26/2017
Common Collector (2)
E
B
C
E
B
C
Electron Flow Current Flow
Common Collector Common Collector
n
p
n
n
p
n
n
p
n
n
p
n
![Page 19: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/19.jpg)
BJT Bias 19 Young Won Lim05/26/2017
BJT Bias
n p nE C
n p n
B E
B
C E
B
C
n
p
n
n
p
n
n
p
n
n
p
n
E
B
C E
B
C
E C
B
++
+
+
+
+
– –
–
–
– –
Common CollectorCommon EmitterCommon Base
V BE V CB
V BE V CE V CB V CE
![Page 20: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/20.jpg)
BJT Bias 20 Young Won Lim05/26/2017
Common Emitter (2)
Electron Flow
n p n
E C
Current Flow
n p n n p n
B
![Page 21: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/21.jpg)
BJT Bias 21 Young Won Lim05/26/2017
Maintain Magnetic Field
Before Initial Final
No Energy in magnetic field
+
−
Induced EMF
![Page 22: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/22.jpg)
BJT Bias 22 Young Won Lim05/26/2017
Storing Magnetic Energy
v vR
vL
i iR
iL
= +
= =
![Page 23: BJT Bias - Wikimedia · 26/05/2017 · BJT Bias 10 Young Won Lim 05/26/2017 Two voltage supplies controls V BE & V CB E B C E B C n p n n p n Common Base Common Emitter Common Collector](https://reader033.vdocuments.net/reader033/viewer/2022050602/5fa9dee71a100326725a2e83/html5/thumbnails/23.jpg)
Young Won Lim05/26/2017
References
[1] http://en.wikipedia.org/[2] J.H. McClellan, et al., Signal Processing First, Pearson Prentice Hall, 2003