Op-Amp Gain Calculator

Electronics Engineering Tool for Inverting, Non-Inverting, and Differential Amplifier Configurations

Op-Amp Inverting, Non-Inverting, and Differential Amplifier Circuit Schematics
Inverting (left) · Non-Inverting (centre) · Differential (right)

Inverting Amplifier

Output is phase-inverted. Gain = −Rf / Rin

Voltage Gain (Av)
−10
V/V
Gain in dB
20.0 dB

Av = −Rf / Rin

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Understanding Op-Amp Gain Configurations

An operational amplifier (op-amp) can be configured in several ways to amplify signals. The three most common linear configurations are the inverting amplifier, the non-inverting amplifier, and the differential amplifier.

Inverting Amplifier

The input signal is applied to the inverting (−) terminal through Rin. The gain is set by the ratio of the feedback resistor Rf to Rin, and the output is inverted (180° phase shift). Common parts: LM358, TL072, NE5532.

Non-Inverting Amplifier

The input is applied to the non-inverting (+) terminal. The output is in phase with the input and the minimum achievable gain is 1 (unity gain buffer). Extremely high input impedance makes this ideal for sensor signal conditioning.

Differential Amplifier

Amplifies the voltage difference between two inputs while rejecting signals common to both (common-mode rejection). Used heavily in instrumentation and sensor interfaces. For best CMRR performance, use precision matched resistors.