68.1.7. Small Signal Parameters Calculation

Try these first

1. 1.

   What is transconductance?

   Hint

   Think of it as how well the transistor can control current.

2. 2.

   If a transistor has a bias current of 5 mA, what is the transconductance?

   Hint

   Use Vt value for calculation.

3. 3.

   What is the formula for transconductance?

   • g = I/Vt
   • g = V/IR
   • g = I*V

   Hint

   Think about the relationship of current to voltage in the small signal model.

4. 4.

   True or False: The output resistance increases with higher Early voltage.

   • True
   • False

   Hint

   Remember, VA influences output in transistors.

5. 5.

   Design a differential amplifier using two BJTs with specified parameters. Calculate the small signal parameters and assess their implications.

   Hint

   Refer to standard formulas and remember how resistor values affect β!

6. 6.

   Given a common emitter transistor with variable bias currents, explore how altering these currents affects output signal swing.

   Hint

   Think about how higher biasing affects overall collector current.