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ENT 162 –Analog Electronics
School of Mechatronic Engineering, UniMAP
Tutorial 1
Part 1 : Diode Basics, Application and Special Diodes
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What is the maximum number of electrons that can exist in the 3 rd shell of an atom?
A certain atom has four valence electrons. What type of atom is it?
In a silicon crystal, how many covalent bonds does a single atom form?
What happens if heat is added to silicon?
Name the two energy levels at which current is produced in silicon?
Describe the process of doping and explain how it alters the atomic structure of silicon.
What is antimony? What is boron?
How is the electric field across the pn junction?
Because of its barrier potential, can a diode be used as a voltage source? Explain.
To forward-bias a diode, to which region must the positive terminal of a voltage source be
connected?
Explain why a series resistor is necessary when a diode is forward-biased.
Explain how to generate the forward-bias portion of the characteristic curve.
Determine whether each diode in Figure 1 is forward-biased or reverse-biased.
Determine the voltage across each diode in Figure 1, assuming the practical model.
Figure 1
Prepared by:Aisyah Hartini Jahidin
Sem 2, 2009/2010
1
ENT 162 –Analog Electronics
School of Mechatronic Engineering, UniMAP
15. Draw the output voltage waveform for the circuit in Figure 2 and include the voltage
values. Calculate the peak forward current through the diode.
Figure 2
16. Determine the peak and average power delivered to RL in Figure 3.
Figure 3
17. Consider the circuit in Figure 4.
(a) What type if circuit is this?
(b) What is the total peak secondary voltage?
(c) Find the peak voltage across each half of the secondary.
(d) Sketch the voltage waveform across RL.
(e) What is the peak current through each diode?
(f) What is the PIV for each diode?
Figure 4
18. What PIV rating is required for the diodes in a bridge rectifier that produces an average
output voltage of 50V?
Prepared by:Aisyah Hartini Jahidin
Sem 2, 2009/2010
2
ENT 162 –Analog Electronics
School of Mechatronic Engineering, UniMAP
19. Sketch the output voltage of the bridge rectifier in Figure 5.
Figure 5
20. A full-wave rectifier produces an 80 V peak rectified voltage from a 60 Hz ac source. If a
10 µF filter capacitor is used, determine the ripple factor for a load resistance of 100 kΩ.
21. Determine the output voltage waveform for each circuit in Figure 6.
Figure 6
22. Sketch the output voltage waveform for the circuit in Figure 7.
Figure 7
Prepared by:Aisyah Hartini Jahidin
Sem 2, 2009/2010
3
ENT 162 –Analog Electronics
School of Mechatronic Engineering, UniMAP
23. Describe the output waveform of each circuit in Figure 8, Assume the RC time constant is
much greater than the period of the input.
Figure 8
Prepared by:Aisyah Hartini Jahidin
Sem 2, 2009/2010
4