Question

The statement that best describes the function of a non-inverting amplifier is:

• A. It reverses the phase of the input signal while amplifying it
• B. It amplifies the input signal without altering its phase
• C. It adds multiple input signals into a single output
• D. It generates a fixed waveform output regardless of the input

Hint:

Non-inverting = no phase change. It boosts your signal while keeping it “right side up”!

Answer 1

The Correct Option is B

A non-inverting amplifier is a type of Op-Amp configuration in which the input signal is applied to the non-inverting terminal (\(+\)) of the operational amplifier. The output signal is a scaled (amplified) version of the input with no phase reversal, meaning the input and output waveforms are in phase.
The voltage gain \( A_v \) for a non-inverting amplifier is given by: \[ A_v = 1 + \frac{R_f}{R_1} \] where \( R_f \) is the feedback resistor and \( R_1 \) is the resistor connected to ground. Other options explained:

• (A) Describes an inverting amplifier, not a non-inverting one.
• (C) Refers to a summing amplifier configuration, not applicable here.
• (D) Fixed waveform generation is unrelated — that’s more relevant to oscillators or waveform generators.

Thus, a non-inverting amplifier amplifies the input signal without changing its phase.