preview

Low-pass Filter and Critical Frequency Essay

Satisfactory Essays
Open Document

Name:
Alfredo del junco
Date:
2/22/2014

ET 1410 Final Exam

1. 1. An IC op-amp has ________.

a. two inputs and two outputs

b. one input and two outputs

c. two inputs and one output

d. one input and one output

2. In the common mode, ________.

a. both inputs are grounded

b. the outputs are connected together

c. an identical signal appears on both inputs

d. the output signals are in phase

3. If Av(d) = 3500 and Acm = 0.35, the CMMR is ________.

a. 1225

b. 3500

c. 80dB

d. 90dB

4. A certain op-amp has bias currents of 50 μA and 49.3 μA. The input off-set current is ________.

a. 700 nA

b. 99.3 μA

c. 49.65 μA

d. None of these

5. A certain non-inverting …show more content…

When 2 low-pass filters are cascaded, the roll-off rate becomes ________.

a. -60 dB

b. -20 dB

c. -10 dB

d. -40 dB

24. When a low-pass and a high-pass filter are cascaded to form a band-pass filter with a gain of 0 dB at center frequency, the critical frequency of the low-pass filter must be ________.

a. equal to the critical frequency of the high-pass filter

b. less than the critical frequency of the high-pass filter

c. greater than the critical frequency of the high-pass filter

d. adjusted in a way that Q becomes 10

25. When the gain of a filter is minimum at its center frequency, it is a ________.

a. band-pass filter

b. band-stop filter

c. Sallen-Key low-pass filter

d. 2nd order high-pass filter

For questions 26 through 30, refer to Figure 3.

26. The circuit in Figure 3 is a ________.

a. band-pass filter

b. low-pass filter

c. high-pass filter

d. band-stop filter

27. The critical frequency is ________.

a. 1.48 kHz

b. 8.84 kHz

c. 491 MHz

d. None of the above

28. If C1 is accidentally replaced with a value 0.15 μF instead of a 0.015 μF, the bandwidth will be ________.

a. doubled

b. divided by 2

c. remain the same

d. divided by 10

29. If C1 is accidentally replaced with a value 0.15 μF instead of a 0.015 μF, the number of poles will ________.

a. increase by 1

b. decrease by 1

c. remain the same

d. double

30. If

Get Access
Related
Get Access