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==Under Progress== |
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==Bipolar Junction Transistor== |
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* An npn BJT has two layers of n-type material, known as the collector and emitter, and in between a layer of p-type material, known as the base. |
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* In order for a BJT to have a good performance, the base current needs to be small compared to the collector current. |
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<math>\beta=i_C/i_D</math> |
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*Operation in the active region: |
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*The base-emitter junction is forward biased. |
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*The base-collector junction is reverse biased. |
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*As amplifiers, BJTs operate in the active region. |
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*As switches, BJTs operate in saturation and cutoff. |
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Steps to analyze large signal dc models for BJT |
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1. Assume an operating region for the BJT like saturation, cutoff or active. |
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2. Solve the circuit to find <math>I_C, I_D, and V_CE</math> |
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3. Check to see if the values found in Step 2 are consistent with the assumed operating state. If so the solution is complete; otherwise return to Step 1. |
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