This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: R D = 2 k V DD = 25 V V D I D 2 3. (a) Describe, with the aid of a diagram, the current-voltage characteristic of the Zener diode. [2 marks] (b) Draw a labelled circuit diagram of a simple Zener shunt regulator and also show the circuit equivalent of the Zener diode. [2 marks] (c) A Zener shunt regulator has a resistor of 120 connected in series with the Zener diode. The p.d. across the diode is 4.92 V when the current through the diode is 10 mA and 4.98 V when the current is 25 mA. Determine the dynamic resistance of the diode [2 marks] (d) If the supply voltage was 11.0 V when the diode current was 10 mA, find the load current at that time. [4 marks] (e) If the supply voltage remains unchanged throughout, determine the load regulation of the circuit. [4 marks] 4. State the condition for a metal-semiconductor junction to act as a rectifying contact in a Schottky diode and explain with the aid of energy band diagrams how it operates. [6 marks]...
View Full Document
- Spring '11