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Transcript of 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor...
![Page 1: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/1.jpg)
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Electronic CircuitsElectronic Circuits
AMPLIFIERSAMPLIFIERS
![Page 2: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/2.jpg)
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• Demostrate Transistor Amplification
• Determine Transistor Biasing.
• Explain Transistor Regions - Emitter, Base, Collector.
• Explore Transistors as Switches
Objectives
Electronic CircuitsElectronic Circuits
![Page 3: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/3.jpg)
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Amplifier Out
InGain=
In
Out
Electronic CircuitsElectronic Circuits
![Page 4: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/4.jpg)
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N
P
NThe collector is lightly doped. C
The base is thin and is lightly doped.
B
The emitter is heavily doped. E
NPN Transistor Structure
Electronic CircuitsElectronic Circuits
![Page 5: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/5.jpg)
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The C-B junction is reverse biased.
N
P
N
NPN Transistor Bias
C
B
E
No current flows.
Electronic CircuitsElectronic Circuits
![Page 6: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/6.jpg)
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The B-E junction is forward biased.
N
P
N
NPN Transistor Bias
C
B
E
Current flows.
Electronic CircuitsElectronic Circuits
![Page 7: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/7.jpg)
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When both junctionsare biased....
N
P
N
NPN Transistor Bias
C
B
E
Current flowseverywhere.
Most of the emitter carriersdiffuse through the thin base
region since they are attractedby the collector.
Note that IB is smallerthan IE or IC.
IC
IB
IE
Electronic CircuitsElectronic Circuits
![Page 8: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/8.jpg)
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N
P
N C
B
E
Although IB is smallerit controls IE and IC.
IC
IB
IE
Note: when the switch opens, all
currents go to zero.
Gain is something smallcontrolling something large
(IB is small).
Electronic CircuitsElectronic Circuits
![Page 9: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/9.jpg)
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Amplifier Out
InGain=
In
Out
Electronic CircuitsElectronic Circuits
![Page 10: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/10.jpg)
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The C-B junction is reverse biased.
N
P
N
NPN Transistor Bias
C
B
E
No current flows.
Electronic CircuitsElectronic Circuits
![Page 11: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/11.jpg)
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The B-E junction is forward biased.
N
P
N
NPN Transistor Bias
C
B
E
Current flows.
Electronic CircuitsElectronic Circuits
![Page 12: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/12.jpg)
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When both junctionsare biased....
N
P
N
NPN Transistor Bias
C
B
E
Current flowseverywhere.
Most of the emitter carriersdiffuse through the thin base
region since they are attractedby the collector.
Note that IB is smallerthan IE or IC.
IC
IB
IE
Electronic CircuitsElectronic Circuits
![Page 13: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/13.jpg)
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N
P
N C
B
E
Although IB is smallerit controls IE and IC.
IC
IB
IE
Note: when the switch opens, all
currents go to zero.
Gain is something smallcontrolling something large
(IB is small).
Electronic CircuitsElectronic Circuits
![Page 14: 1 Electronic Circuits AMPLIFIERS. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector.](https://reader033.fdocuments.in/reader033/viewer/2022061612/5697bf7b1a28abf838c83a16/html5/thumbnails/14.jpg)
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Transistor Structure and Bias QuizThe heaviest doping is found in the ___________ region.
emitter
The thinnest of all three regions is called the ____________.
base
The collector-base junction is ___________ biased. reverse
The base-emitter junction is ____________ biased. forward
The majority of the emitter carriers flow to the ___________. collector
Electronic CircuitsElectronic Circuits