6.2.2. Model for Diodes

Try these first

1. 1.

   What is the typical forward voltage drop across a silicon diode?

   Hint

   Think about what voltage allows current to flow in a silicon diode.

2. 2.

   Name the two states of a diode and briefly describe each.

   Hint

   Consider what happens when a diode is forward or reverse biased.

3. 3.

   What is the typical voltage drop across a silicon diode in the 'on' state?

   • 0.2V
   • 0.6V
   • 1.2V

   Hint

   Focus on the standard voltage values for silicon diodes.

4. 4.

   True or False: In the 'off' state of a diode, it behaves like a low resistance.

   • True
   • False

   Hint

   Consider the definition of diode states.

5. 5.

   A circuit consists of a silicon diode and a resistor of 15 kΩ. If the diode voltage drop is approximated to 0.7V, calculate the expected current through the diode.

   Hint

   Remember to apply the voltage drop across the resistor.

6. 6.

   In a piecewise linear model of a diode, derive the expressions for both the 'on' and 'off' conditions. How do they impact the analysis?

   Hint

   Consider how you relate current to voltage in both models.