7.5. Bias Conditions

Try these first

1. 1.

   What bias condition is applied to the base-emitter junction for normal operation?

   Hint

   Think about how the voltage is applied in relation to p-type and n-type.

2. 2.

   What happens to the current in a BJT during forward bias?

   Hint

   Recall how minority carriers behave under forward bias conditions.

3. 3.

   What is the biasing condition for the base-emitter junction in BJTs?

   • Forward Bias
   • Reverse Bias
   • No Bias

   Hint

   Consider the typical voltage applications to BJTs.

4. 4.

   True or False: The saturation current is higher during forward bias than in reverse bias.

   • True
   • False

   Hint

   Think about when saturation current is determined.

5. 5.

   Calculate the emitter current if V_BE is 0.7V, assuming I_S is 10^-12 A and V_T is 26mV.

   Hint

   Use the exponential relationship of the current under forward bias.

6. 6.

   Explain how bias conditions can affect the overall gain in an amplifier using BJTs.

   Hint

   Consider how input current verifies against output current in realistic amplifier design.