1. An op-amp has an open-loop gain of 100,000 and a cutoff frequency of 40 Hz. Find the open-loop gain at a frequency of 30 Hz.
2. Refer to the given figure. The input impedance of this circuit is
3. What is the level of the voltage between the input terminals of an op-amp?
4. An op-amp has an open-loop gain of 75,000 and a cutoff frequency of 100 Hz. At 1 kHz the open-loop gain is down by
5. What is the difference output voltage of any signals applied to the input terminals?
6. A three-stage op-amp can have a maximum phase lag of ________°.
7. The summing amplifier contains an inverting amplifier.
8. What is the open-loop gain of an op-amp at the gain-bandwidth product of the op-amp?
9. Consumer protection Act was passed in?
10. Refer to the given figure. A dc input signal of –50 mV is applied. You would measure ________ from the inverting input to ground.
11. The ________ amplifier configuration has the highest input impedance and the lowest output impedance of the three basic op-amp configurations.
12. This circuit is referred to as a(n) ________.
13. Refer to the given figure. Calculate the bandwidth.
14. Refer to this figure. The purpose of R4 is
15. Refer to the given figure. Find the midrange gain of this amplifier.
16. An RC network has R = 47 k and C = 0.22 F. What is the cutoff frequency?
17. A certain op-amp has an open-loop voltage gain of 150,000. What is this gain expressed in dB?
18. An IC unit made using both ________ and ________ transistors is called a ________ circuit.
19. 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 ________.
20. What is the slew rate of an op-amp if the output voltages change from 2 V to 3 V in 0.2 ms?
21. Refer to the given figure. This amplifier is known as
22. Calculate the output voltage if R1 = R2 = R3 = 100 , Rf = 1 k, and V1 = V2 = V3 = 50 mV.
23. If Rf = R1, the voltage gain is ________.
24. The maximum rate of change of the output voltage in response to a step input voltage is the ________ of an op-amp.
25. At what input voltage level does the output voltage level become numerically equal to the value of the differential gain of the amplifier?