Electronics - Operational Amplifiers

Exercise :: Operational Amplifiers - General Questions

31. 

In an open-loop op-amp circuit, whenever the inverting input (–) is negative relative to the noninverting input (+), the output will:

A. swing negative
B. close the loop
C. be balanced
D. swing positive

Answer: Option D

Explanation:

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32. 

With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio?

A. –87.9 dB
B. –43.9 dB
C. 43.9 dB
D. 87.9 dB

Answer: Option D

Explanation:

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33. 

If the input to a comparator is a sine wave, the output is a:

A. ramp voltage
B. sine wave
C. rectangular wave
D. sawtooth wave

Answer: Option C

Explanation:

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34. 

What three subcircuits does a phase locked loop (PLL) consist of?

A. phase comparator, comparator, and VCO
B. phase comparator, bandpass filter, and VCO
C. phase comparator, bandpass filter, and demodulator
D. phase comparator, low-pass filter, and VCO

Answer: Option D

Explanation:

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35. 

The major difference between ground and virtual ground is that virtual ground is only a:

A. voltage reference
B. current reference
C. power reference
D. difference reference

Answer: Option A

Explanation:

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