Low-pass Filter and Critical Frequency Essay

1302 Words Aug 19th, 2014 6 Pages
Alfredo del junco

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
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a. increase by +20 dB

b. decrease by – 20 dB

c. remain the same

d. decrease by – 40 dB

31. An oscillator differs from an amplifier because ________.

a. it has more gain

b. it requires no input signal

c. it requires no DC supply

d. it always has the same output

32. One condition for oscillations to occur is ________.

a. a phase shift around the feedback loop of 180°

b. a gain around the feedback loop of one-third

c. a phase shift around the feedback loop of 0°

d. a gain around the feedback loop of less than 1

33. In a certain oscillator, Acl = 50. The attenuation of the feedback network must be ________.

a. 1

b. 0.01

c. 10

d. 0.02

34. In a Wien-Bridge Oscillator, if the resistances in the feedback network are decreased, the frequency ________.

a. decreases

b. increases

c. remains the same

d. depends on the properties of the amplifier

35. An oscillator whose frequency changes as a function of a variable DC voltage is known as ________.

a. a Wien-Bridge Oscillator

b. a VCO

c. a phase-shift oscillator

d. an astable multivibrator

36. An astable multivibrator is ________.

a. an nonsinusoidal oscillator

b. a one-shot

c. characterized by having two stable states

d. a sinusoidal oscillator

37. The term “monostable” means ________.

a. one output

c. one time constant

d. one stable state

For questions 38 through

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