Electronics Paper 2, Nov/Dec. 2010  
Questions: 1 2 3 4 5 6 7 8 9 10 Main
General Comments

Question 3

(a) List two characteristics of an ideal operational amplifier.
(b) Draw and label a circuit diagram to show how an ideal amplifier can
be used as a/an
(i) inverting amplifier;
(ii) non-inverting amplifier.


The expected answers were:
(a) (i) Infinite loop-gain
(ii)High input impedance
(iii) infinite bandwidth
(iv)low output impedance
(b) (i)

A pure' recall-type' question on operational amplifiers. For the ideal device, the characteristics include infinite input impedance, gain, and bandwidth and zero output impedance. When connected in the 'non-inverting mode', the op- AMP'S positive and negative terminals are connected respectively to input and earth; or vice versa for the 'inverting mode' connection. The question was on Amplifiers. The question was unpopular. The candidates did poorly in it.

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