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# Electronic Devices - Operational Amplifiers

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### Exercise

"Nothing in life is to be feared, it is only to be understood."
- Marie Curie
21.

An RC network has R = 47 k and C = 0.22 F. What is the cutoff frequency?

 A. 154 Hz B. 1540 Hz C. 1.54 Hz D. 15.4 Hz

22.

A certain op-amp has an open-loop voltage gain of 150,000. What is this gain expressed in dB?

 A. 51.7 dB B. 103.5 dB C. 150,000 dB D. 5.18 dB

23.

An IC unit made using both ________ and ________ transistors is called a ________ circuit.

 A. bipolar, MOSFET, BiFET B. bipolar, MOSFET, BiMOS C. TTL, MOSFET, TailFET

24.

Refer to the given figure. You need an amplifier with an input impedance of 12 k. You must not change the amplifier voltage gain. The new value of Ri would be ________ and the new value of Rf would be ________.

 A. 10 k, 100 k B. 13.3 k, 120 k C. 12 k, 108 k D. 12 k, 120 k

25.

What is the slew rate of an op-amp if the output voltages change from 2 V to 3 V in 0.2 ms?

 A. 5 V/ms B. 3 V/ms C. 2 V/ms D. 1 V/ms