UNIVERSITY OF MINES AND TECHNOLOGY, TARKWA
DEPARTMENT OF ELECTRICAL AND ELECTRONIC ENGINEERING
APPLIED ELECTRONICS (MR/PE/ES 162)
20/25/2020
ASSIGNMENT 1
ANSWER ALL QUESTIONS
1.
2.
3.
4.
5.
Define input bias current.
List three (3) characteristics of a practical op-amp.
Define positive feedback and state (3) disadvantages of positive feedback.
What is virtual ground concept of an ideal op-amp?
With the aid of a well labelled diagram explain the following:
i. Double-ended differential input mode.
ii. Common-mode input mode.
6. Draw the circuit diagram of a current-shunt feedback network and derive an expression for the closedloop gain (Acl).
7. Determine the common-mode gain of an op-amp that has a differential open-loop voltage gain of
200000 and CMRR of 90 decibels.
8. Figure 1 shows a non-inverting feedback amplifier. If the gain of the amplifier without feedback is
10,000. find:
i. Feedback gain β
ii. The overall voltage gain (Acl)
iii. Output voltage if the input voltage is 1 mV
Figure 1
9. Determine the output voltage for the circuit in Figure 2
Figure 2
10. For the summing op-amp shown in Figure 3, determine the output voltage, V0.
Figure 3
Due: 27/05/2020