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Operational Amplifier – 1 – 7

31. The common-mode voltage gain is ….

(a) smaller than differential voltage gain
(b) equal to differential voltage gain
(c) greater than differential voltage gain
(d) none of the above

ANSWER

EXPLANATION

32. The input stage of an OP-amp is usually a ….

(a) differential amplifier
(b) class Bpush-pull amplifier
(c) CEamplifier
(d) swamped amplifier

ANSWER

EXPLANATION

33. The common-mode voltage gain of a differential amplifier is equal to RC divided by ….

(a) r′e
(b) 2 r′e
(c) r′e/2
(d) 2 RE

ANSWER

EXPLANATION

34. Current cannot flow to ground through ….

(a) a mechanical ground
(b) an a.c. ground
(c) a virtual ground
(d) an ordinary ground

ANSWER

EXPLANATION

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