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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

Explanation
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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

Explanation
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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

Explanation
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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

Explanation
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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