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Non-Inverting Amplifier

In a non-inverting amplifier the signal enters directly at the positive input, while $R_g$ and $R_f$ form a feedback divider to the negative input. The gain is always positive and at least 1, and becomes large only if $R_g$ is small compared with $R_f$ .

A=1+\dfrac{R_f}{R_g}

voltage gain, non-inverting amplifier

Symbols

$R_g$	resistor to ground from the - input	$\Omega$
$R_f$	feedback resistor	$\Omega$
$A$	voltage gain

Example

$R_g=2.2$ kΩ, $R_f=22$ kΩ:

$A=1+22/2.2=11$ .

A voltage follower is a special case:

R_f=0

and

R_g\to\infty

gives

A=1

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Part of Electronics: Operational amplifiers.