Lecture14-BJT+QuantitativeAndPerform

Lecture14-BJT+QuantitativeAndPerform - ECE 3040:...

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ECE 3040 - Dr. Ying Zhang Georgia Tech ECE 3040: Microelectronic Circuits Lecture 14 Reading : Pierret 11.1
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ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture Bipolar Junction Transistor npn pnp
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ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture BJT Circuit Configurations Both the input and output share the base “in common” (Used occasionally) Both the input and output share the emitter “in common” (the most widely employed configuration) Both the input and output share the Collector “in common” (seldom used)
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ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture BJT Biasing Modes Active: Is useful for amplifiers. Most common mode Saturation: Equivalent to an on state when transistor is used as a switch Cutoff : Equivalent to an off state when transistor is used as a switch Inverted: Rarely if ever used.
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ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture BJT Electrostatics in Equilibrium Emitter is heavily doped W=width of the base quasi-neutral region W B =Total Base width W EB =Base-Emitter depletion width W CB =Base-Collector depletion width W EB < W CB Base-Emitter built in voltage Base-Collector built in voltage Note: This slide refers to a pnp transistor
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ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture BJT Operational Considerations Equilibrium Active Mode Forward Biased Reverse Biased Many Holes injected into the base Few electrons injected into the emitter Injected Holes diffuse through the base and are collected by the huge electric field at the collector Narrow Base required to minimize recombination Note: This slide refers to a pnp transistor
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ECE 3040 - Dr. Ying Zhang
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Lecture14-BJT+QuantitativeAndPerform - ECE 3040:...

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