range of semiconductor devices and circuits

range of semiconductor devices and circuits

 

Apply testing procedures to a range of semiconductor devices and circuits

Use relevant literature for testing semiconductor devices and circuits

Q1: Describe the procedure of testing a diode using an Ohmmeter only?
Explain how to determine if the diode is faulty or not?
Illustrate your answer with drawings of the testing procedure.
(500 words)
Q2: For the circuit of figure 1, a 100? resistor is connected to a variable DC voltage source through a diode D. Use a software package to determine the Forward and Reverse characteristics of the diode. Provide a list of measured diode voltage (Vd) and diode current (Id) values and a diode characteristics graph. Explain how the Forward resistance and reverse resistance of the diode can be determined.

 

Q3: For the full wave rectifier shown in figure 2, determine the RMS value of the load current knowing that the forward voltage of the diode is 0.7V, the source peak voltage is 100V and the source frequency is 50Hz. Show wave forms of the primary voltage, the secondary voltage and the load voltage.
Figure 2
Q4: For the full wave rectifier circuit illustrated in figure 3, the RMS value of the supply voltage is 240V and the frequency is 50Hz.
a. Calculate the ripple factor
b. Calculate the ripple factor if the filter capacitor increased to 100µF and the load resistor is increased to 12k?
c. Illustrate the primary and secondary voltages of the transformer and the output voltage of the circuits in time domain showing all values.

Q5: Illustrate a complete power supply using block diagrams, showing all possible voltage wave forms. Explain the testing procedure to determine a fault at every stage of the power supply circuit.
(250 words)

Analyse the operation of different types of amplifier

Q1:Operational amplifiers are used for different applications in electronic engineering. Showing all characteristics, waveforms and electronic circuits, describe the operation of an operational amplifier as:
a. Differential amplifier
b. Summing amplifier
Show the relationship between input and output voltages of the amplifiers.

(250 words each)
Q2: List 2 types of low power transistor amplifiers. Describe and Analyse their applications, configurations, operation and illustrate both input and output waveforms.
(250 words each)

Q3: For the amplifier circuit shown in figure 4, determine:

a. VB, VE, VC, VCE, IB, IE and IC

b. aDC and ßDC

c. If a signal voltage of 50 mV is applied to the base, determine the output signal voltage of the amplifier and calculate the dc collector voltage on which the output voltage is riding

d. Replace R4 with a 5kO resistor, recalculate the variables required in b and c. Use both set of results to evaluate the performance of both amplifiers.
Evaluate the actual performance of different types of amplifier
Compare the analysis with the measured results

Q1: Practically C1 and C2 are used to isolate DC components from both input and output signals of the transistor amplifier. Using the designed circuit of the transistor amplifier given in figure 5:

1. Build the designed amplifier circuit of Figure 5 on a printed circuit board (PCB)
2. Apply a 50mV sinusoidal signal at the input. Using an oscilloscope measure the input and output voltages at different frequencies (5Hz to 100MHz or beyond if permitted)
3. Repeat the output voltage measurement at few frequencies at both ends of the output coupling capacitor C2.
4. Calculate the gain in dB along the frequency range
5. Draw the voltage gain of the amplifier as function of the frequency of the signal
Q2: Compare the measured results of the amplifier circuit of Q1with those obtained analytically in Q3 of this task.

Q3: Using an inverting operational amplifier and resistors, design and build a voltage adder (summing amplifier) to add up three different voltages and provide a single output voltage:
1. Select resistors values to give a voltage gain of (5, 10 and 15) for input voltages V1, V2 and V3 respectively.
2. Provide a schematic diagram of the designed circuit.
3. Calculate the output voltage of the amplifier for the following inputs:
V1 (mV) V2 (mV) V3 (mV)
2 4 6
6 2 4
4 6 2

Table 1

4. Simulate the designed circuit using a computer software package and provide screen shoots for the designed circuit.
5. Using the computer simulation, calculate the output voltages for the input values given in table 1.
6. Compare and discuss both calculated and simulated voltage outputs.
Modify circuit designs to meet revised specifications

1. Modify the design of the amplifier’s circuit of figure 5 to give the following revised specifications:

a. An increase in the amplifier’s gain by 20%. Calculate the new gain at different frequencies to reflect the new design specification.

b. A reduction in the amplifier’s gain by 20%. Calculate the new gain at different frequencies to reflect the new design specification.

2. Using a computer software package, simulate both designs and measure their voltage gain to reflect the new design specifications.

3. Provide schematic diagrams of both new circuits

4. Provide illustrations for all simulation results to reflect the new revised specifications.

5. Discuss and comments on this exercise and the benefit of using computer simulation to change electronics circuits design to meet revised specifications.

 
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