The major difference between ground and virtual ground is that virtual ground is

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Question
The major difference between ground and virtual ground is that virtual ground is only a:
Options
A. voltage reference
B. current reference
C. power reference
D. difference reference

Correct Answer

voltage reference

Operational Amplifiers problems

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6. 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?
Options
A. 1.4 mV rms
B. 650 mV rms
C. 4.55 V rms
D. 0.455 V rms

7.
Decreasing the gain in the given circuit could be achieved by
Options
A. reducing the amplitude of the input voltage
B. increasing the value of the feedback resistor
C. increasing the value of the input resistor
D. removing the feedback resistor

8. The input offset current equals the
Options
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

9. With negative feedback, the returning signal
Options
A. is proportional to the output current
B. is proportional to the differential voltage gain
C. opposes the input signal
D. aids the input signal

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