Electronics - Operational Amplifiers

Exercise :: Operational Amplifiers - General Questions

46. 

A differential amplifier has a common-mode gain of 0.2 and a common-mode rejection ratio of 3250. What would the output voltage be if the single-ended input voltage was 7 mV rms?

A. 1.4 mV rms
B. 650 mV rms
C. 4.55 V rms
D. 0.455 V rms

Answer: Option C

Explanation:

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47. 

The magnitude of closed-loop voltage gain (Acl) of an inverting amplifier equals:

A. the ratio of the input resistance to the feedback resistance
B. the open-loop voltage gain Aol
C. the feedback resistance divided by the input resistance
D. the input resistance

Answer: Option C

Explanation:

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48. 

What is the difference between common-mode and differential-mode input signals?

A. phase relationship
B. voltage
C. current
D. apparent power

Answer: Option A

Explanation:

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49. 

A circuit that uses an amplifier with passive filter elements is called a(n):

A. relaxation oscillator
B. signal generator
C. differential amplifier
D. active filter

Answer: Option D

Explanation:

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50. 

The input offset current equals the

A. average of two base currents
B. collector current divided by the current gain
C. difference between two base-emitter voltages
D. difference between two base currents

Answer: Option D

Explanation:

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