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Explain Voltage divider bias or self-bias
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Features:

  1. The resistors $R_1$ and $R_2$ form a potential divider to apply a fixed voltage $V_B$ to the base.
  2. A resistance $R_E$ has been connected in the emitter circuit. This resistor is not present in the fixed bias or collector to the base bias circuit.
  3. Base voltage $$V_B=V_{R2}=\frac{R_2}{R_1+R_2 } \times V_{CC}$$
  4. Bias stabilization using voltage divider bias circuit
  5. If $I_c$ increases due to change in temperature or $β_{dc}$
  6. Then $I_E$ increases
  7. Hence drop across $R_E$ increases $(V_E=I_E R_E )$
  8. Hence $I_C$ also decreases. Thus the compensation for increase in $I_C$ is achieved.
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