Chapter 4 BJT4 - Chapter 4 Bipolar Junction Transistor(BJ T...

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SJTU J. Chen 1 3/2/12 Chapter 4 Bipolar Junction Transistor (BJ T)
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3/2/12 2 J. P C h e n Common-Emitter Amplifier
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3/2/12 3 J. P C h e n DC circuit AC circuit ? ? ? ? ? ? ? replacing each capacitor with an open circuit ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? replacing each capacitor and dc voltage source with a short circuit replacing each dc current source with an open circuit
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3/2/12 4 J. P C h e n e.g. 100 F v.s. 1 k @ 40 Hz 1 1 40 1 2 k c fc ϖ π = =
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3/2/12 5 J. P C h e n Equivalent circuit obtained by replacing the transistor with its hybrid- π model. Common-Emitter Amplifier
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3/2/12 6 J. P C h e n Input resistance Voltage gain Overall voltage gain Output resistance Short-circuit current gain Characteristics of CE Amplifier π r R in ) // // ( L C o m v R R r g A - = sig o L C v R r r R R G + - β ) // // ( C out R R - is A
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3/2/12 7 J. P C h e n Large voltage gain Inverting amplifier Large current gain Input resistance is relatively low. Output resistance is relatively high. Frequency response is rather poor. Summary of CE amplifier
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3/2/12 8 J. P C h e n The Common-Emitter Amplifier with a Res istance in the Emitter
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3/2/12 9 J. P C h e n The Common-Emitter Amplifier with a Res istance in the Emitter
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3/2/12 10 J. P
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Chapter 4 BJT4 - Chapter 4 Bipolar Junction Transistor(BJ T...

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