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Operational Amplifier – 1 – 3

11. If ADM = 3500 and ACM = 0.35, the CMRR is ….

(a) 1225
(b) 10,000
(c) 80 dB
(d) 
b and c

ANSWER

EXPLANATION

12. With zero volts on both inputs, an Op-amp ideally should have an output ….

(a) equal to the positive supply voltage
(b) equal to the negative supply voltage
(c) equal to zero
(d) 
equal to the CMRR

ANSWER

EXPLANATION

13. Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is ……

(a) 1
(b) 2000
(c) 80 dB
(d) 
100,000

ANSWER

EXPLANATION

14. A certain OP-amp has bias currents of 50 µA and 49.3 µA. The input offset current is ….

(a) 700 nA
(b) 99.3 μA
(c) 49.7 μA
(d) 
none of these

ANSWER

EXPLANATION

15. The output of a particular OP-amp increases 8 V in 12 µs. The slew rate is ….

(a) 90 V/μs
(b) 0.67 V/μs
(c) 1.5 V/μs
(d) 
none of these

ANSWER

EXPLANATION

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