In a non-inverting amplifier circuit, to which op-amp input terminal is the input signal applied?

The input signal is applied to the non-inverting (+) input of the op-amp.

State the formula for the voltage gain of a non-inverting amplifier.

Gain = 1 + (Rꜰ / R₁), where Rꜰ is the feedback resistor and R₁ is the resistor connected to ground.

Calculate the voltage gain when feedback resistance = 52 kΩ, resistance of R₁ (inverting input to 0 V) = 4 kΩ.

Voltage gain = 1 + (52 ÷ 4) = 14.

What is the minimum possible voltage gain achievable with a non-inverting amplifier?

The minimum possible gain is 1 (unity gain).

Under what resistor conditions does a non-inverting amplifier achieve its minimum gain of unity?

Unity gain occurs when Rꜰ = 0 or when R₁ is infinite.

What would happen to the gain of a non-inverting amplifier if R₁ were removed (open circuit)?

The gain would become unity (minimum gain of 1), as an open circuit R₁ is equivalent to R₁ being infinite.

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Non-inverting amplifier configuration

3 things to know
Paper 3, section B

Overview

The gain formula, why the minimum gain is one, and the phase relationship.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Numbers

How is the gain of a non-inverting amplifier calculated, and what is its minimum?

Numbers

When does a non-inverting amplifier reach unity gain, and what is its phase relationship?

Numbers

What does Rꜰ stand for, and how does the phase behaviour differ from the inverting circuit?

Questions from this subtopic

Each one with the model answer underneath.

1
In a non-inverting amplifier circuit, to which op-amp input terminal is the input signal applied?
Model answer
The input signal is applied to the non-inverting (+) input of the op-amp.
2
State the formula for the voltage gain of a non-inverting amplifier.
Model answer
Gain = 1 + (Rꜰ / R₁), where Rꜰ is the feedback resistor and R₁ is the resistor connected to ground.
3
Calculate the voltage gain when feedback resistance = 52 kΩ, resistance of R₁ (inverting input to 0 V) = 4 kΩ.
Model answer
Voltage gain = 1 + (52 ÷ 4) = 14.
4
What is the minimum possible voltage gain achievable with a non-inverting amplifier?
Model answer
The minimum possible gain is 1 (unity gain).
5
Under what resistor conditions does a non-inverting amplifier achieve its minimum gain of unity?
Model answer
Unity gain occurs when Rꜰ = 0 or when R₁ is infinite.
6
What would happen to the gain of a non-inverting amplifier if R₁ were removed (open circuit)?
Model answer
The gain would become unity (minimum gain of 1), as an open circuit R₁ is equivalent to R₁ being infinite.

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