Exercise: Operational Amplifiers

Questions for: Operational Amplifiers

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: A
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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: D
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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: C
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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: D
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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: D
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