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1
The transistor as a linear power amplifier
vCE QN  VCC  vo
vo
PQN  (VCC  vo )
RL
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The transistor in switching power amplifiers
(ON/OFF state)
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The transistor in switching power amplifiers
ON : iRM=iLo
OFF : iRM =0
Vin
Vo
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The transistor in switching power amplifiers
ON : iRM=iLo
OFF : iRM =0
Vin
Vo
Vin
Simplified circuit
Purpose focus on RM voltage measurement
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The Operational Amplifier
The device LM741
Model of circuit
Simpler model
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Model of circuit
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vo  Ad vId  AcmvIcm
Ad
CMRR  20 log
Acm
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A few basic amplifier circuits
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THE END
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