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Exp 9 - Electronics I Lab EXP 9 Emitter Collector feedback...

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Electronics I Lab EXP 9 Emitter & Collector feedback bias BJTs Instructor: Ms. Lama Amr Class: Monday 14:00 Work Team: Marwan Ayesh 20710041 Mahmoud R. Arekat. 20811853 17.12.10 Theoretical Overview:
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Emitter Feedback: A bias voltage applied to the emitter electrode of a transistor. When a split supply (dual power supply) is available, this biasing circuit is the most effective, and provides zero bias voltage at the emitter or collector for load. The negative supply V EE is used to forward-bias the emitter junction through R E . The positive supply V CC is used to reverse-bias the collector junction. Only two resistors are necessary for the common collector stage and four resistors for the common emitter or common base stage. We know that, V B - V E = V be If R B is small enough, base voltage will be approximately zero. Therefore emitter current is, I E = (V EE - V be )/R E The operating point is independent of β if R E >> R B Collector Feedback Bias: This configuration employs negative feedback to prevent thermal runaway and stabilize the operating point. In this form of biasing, the base resistor
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