19.3.2. Discussion on Small Signal Model

Try these first

1. 1.

   What does the Q-point represent in a BJT circuit?

   Hint

   Consider what operating point means in the context of circuits.

2. 2.

   Define transconductance (gm).

   Hint

   Think about the relationship between input voltage and output current.

3. 3.

   What is the purpose of the small signal model?

   • To analyze only linear circuits
   • To linearize non-linear devices for easier analysis
   • To calculate power loss

   Hint

   Think about what simplifications are needed for circuit analysis.

4. 4.

   True or False: The Q-point changes dynamically with signal processing.

   • True
   • False

   Hint

   Consider if the biasing affects signal processing.

5. 5.

   Given a BJT with a collector current (Ic) of 1 mA and Early voltage (VA) of 50V, calculate the output conductance (go).

   Hint

   Be sure to use the correct units in your calculation.

6. 6.

   A BJT has a transconductance of 5 mA/V and is connected to a load of 2 kΩ. What is the expected voltage gain?

   Hint

   Remember the relationship for voltage gain calculation.