Electronics Handbook/Circuits/NPN Transistor Configurations/Amplifier with 2 Resistors

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Configuration

Circuit without resistors R₁, R₂

Analysis

V_{B} = V_{i}

V_{E} = V_{B} - 0.7 = V_{B}

I_{E} = \frac{V_{E}}{R_{4}} = \frac{V_{B}}{R_{4}}

I_{C} = I_{E}

V_{C} = V_{C} - I_{C} R_{3}

$V_{C} = V_{i} (1 - \frac{R_{3}}{R_{4}})$

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