Page 556 - SUBSEC October 2017_Neat

UNIT 2
MODULE 2: A C THEORY AND ELECTRONICS (cont’d)

SPECIFIC OBJECTIVES EXPLANATORY NOTES SUGGESTED PRACTICAL
ACTIVITIES

Operational Amplifiers (cont’d)

Students should be able to:

4.6. explain the gain-frequency Include the fact that gain
curve for a typical and frequency are usually
operational amplifier; plotted on logarithmic axes
and explain the reason for
this.

4.7. determine bandwidth from a Precise numerical values
gain-frequency curve; related to the response of
the ear are not required.

4.8. draw the circuit diagram for Students should be familiar
both the inverting and non- with several
inverting amplifier with a representations of the
single input; same circuit.

4.9. use the concept of virtual Explanation of why the
earth in the inverting virtual earth cannot be
amplifier; connected directly to earth
although it is “virtually” at
earth potential.

4.10. use expressions for the gain Use the properties of the
of both the inverting ideal op-amp.
amplifier and the non-
inverting amplifier;

4.11. discuss the effect of negative Mention the effect of Use the Inverting amplifier
feedback on the gain and negative feedback on other to investigate the gain as
bandwidth of an inverting op-amp characteristics. frequency of the input
operational amplifier and signal is varied. See
non-inverting amplifier; Appendix II for suggested
practical activity.

4.12. perform calculations related Include “cascaded”
to single-input amplifier amplifiers.
circuits;

4.13. use the fact that a non-
inverting amplifier has a very
high input impedance;

CXC A16/U2/17 56