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Determine the output from the following circuit

(a) 180^o in phase with input signal

(b) 180^o out of phase with input signal

(c) Same as that of input signal

(d) Output signal cannot be determined

I had been asked this question in exam.

This question is from Ideal Operational Amplifier in division Operational Amplifier Characteristics of Linear Integrated Circuits

1 Answer

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by (6.5k points)

The correct answer is:

(b) 180° out of phase with input signal

Explanation:

In an ideal operational amplifier (op-amp), the output voltage depends on the feedback configuration and the input signal. If the circuit is a non-inverting amplifier or inverting amplifier, the output signal's phase relationship with the input signal will differ.

  1. Inverting Amplifier: If the op-amp is configured as an inverting amplifier, the output signal will be 180° out of phase with the input signal, meaning the output will be an inverted version of the input.

  2. Non-inverting Amplifier: If the op-amp is configured as a non-inverting amplifier, the output signal will be in phase with the input signal.

Since the question is asking about phase relationship and does not specify the exact configuration of the op-amp, the most typical case (and the one suggested by "180° out of phase") is the inverting amplifier configuration.

Why not the other options?

  • (a) 180° in phase with input signal: This would apply to a non-inverting amplifier, but the question hints towards an inverting configuration.
  • (c) Same as that of input signal: This would be true for a non-inverting amplifier but not for the typical inverting configuration being referenced here.
  • (d) Output signal cannot be determined: The output can be determined based on standard op-amp configurations.

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