18.1.3. Example Circuit

Try these first

1. 1.

   Define the term 'Q-point' in the context of BJT circuits.

   Hint

   Think about where the transistor operates most efficiently.

2. 2.

   What is a small signal equivalent circuit?

   Hint

   Consider how we deal with tiny changes in input.

3. 3.

   What is the purpose of linearization in analog circuits?

   • To increase complexity
   • To simplify analysis
   • To create non-linear behavior

   Hint

   Why would we want to make something simpler in engineering?

4. 4.

   The Q-point is...

   • True
   • False

   Hint

   Think of where a device functions best.

5. 5.

   Design a circuit that incorporates a BJT and specify how you would find and justify your Q-point. Include calculations for your expected input and output voltages.

   Hint

   Consider the relationship between input currents and output currents, especially focusing on finding the bias point within the linear range.

6. 6.

   Given a linearized BJT circuit model, if the input voltage increases by 0.05V and the gain is measured at 50, calculate the expected output voltage change.

   Hint

   Use the relationship between input and output to express the changes simply.