Operational Amplifier – 1 – 6

26. The node voltage at the top of the tail resistor is closest to ….

(a) collector supply voltage
(b) zero
(c) emitter supply voltage
(d) tail current times base resistance

ANSWER

EXPLANATION

27. The tail current in a differential amplifier equals ….

(a) difference between two emitter currents
(b) sum of two emitter currents
(c) collector current divided by current gain
(d) collector voltage divided by collector resistance

ANSWER

EXPLANATION

28. The differential voltage gain of a differential amplifier is equal to RC divided by ….

(a) r′e
(b) r′e/2
(c) 2 r′e
(d) RE

ANSWER

EXPLANATION

29. The input impedance of a differential amplifier equals r′e times ….

(a) β
(b) RE
(c) RC
(d) 2β

ANSWER

EXPLANATION

30. A common-mode signal is applied to ….

(a) the noninverting input
(b) the inverting input
(c) both inputs
(d) top of the tail resistor

ANSWER

EXPLANATION

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