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Electrical Sciences
EEE F111
Dr
...
Amalin Prince
BITS - Pilani K K Birla Goa Campus
Department of Electrical and Electronics Engineering
Lecture – 25,26,27,29
Bipolar Junction Transistors (BJT):, BJT Biasing, BJT amplifiers
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2
Cutoff and Saturation
Cutoff and Saturation
Transfer Characteristics
DC Load Line
Transistor Amplifiers
Biasing the BJT
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8
Biasing the BJT
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9
Biasing the BJT
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10
Biasing the BJT
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11
Biasing the BJT
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Small signal ac analysis
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13
BJT Amplifier
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BJT Amplifier:: Ac Equivalent Ckt
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Small Signal Analysis
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Small Signal Analysis
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Small Signal Analysis
Analyse the amplifier in the earlier slide
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Small Signal Analysis
Analyse the amplifier in the earlier slide
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19
Small Signal Analysis
Analyse the amplifier in the earlier slide: Amplifier with a coupling capacitor
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20
Small Signal Analysis
Analyse the amplifier in the earlier slide: Amplifier with a coupling capacitor
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21
Small Signal Analysis
Analyse the amplifier in the earlier slide: Amplifier with a coupling capacitor
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22
Practice Problem
For the self-biasing circuit shown in figure, hEF=hfe=100, R1=R2=26kΩ,
RC=980 Ω, RE= 2k Ω and VCC=10 V
...
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23
Small Signal Analysis
Analyse the amplifier
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24
Small Signal Analysis
Analyse the amplifier
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25
Practice Problem
For the emitter followercircuit shown in figure,
hEF=hfe=100, R1=R2=26kΩ, RE=RL= 2kΩ, RS= 2k Ω and
VCC=10 V