When an operational amplifier is used as an inverting amplifier, the angle between its output and input signal is:
Correct answer: E. 180 degrees
- A. 30 degrees
- B. 45 degrees
- C. 60 degrees
- D. 90 degrees
- E. 180 degrees
Explanation
In an inverting amplifier configuration, the input signal is applied to the negative input terminal of the operational amplifier. The output signal is then inverted with respect to the input signal and amplified by a factor determined by the resistor values used in the circuit. Since the output signal is inverted with respect to the input signal, the phase difference between the two signals is 180 degrees. This means that the output signal is exactly opposite in polarity to the input signal. Therefore, the angle between the output and input signal in an inverting amplifier is 180 degrees.
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