Op-Amp Gain Calculator
What is Op-Amp Gain?
An operational amplifier (op-amp) is one of the most important building blocks in electronics and communication systems. Op-amps are widely used in signal amplification, filtering, instrumentation, audio systems, control systems, and many ECE applications.
Gain of an op-amp indicates how much the input signal is amplified. It is defined as the ratio of output voltage to input voltage.
There are two commonly used op-amp configurations:
- Inverting Amplifier
- Non-Inverting Amplifier
1. Inverting Op-Amp
In an inverting amplifier, the input signal is applied to the inverting terminal. The output signal is inverted (180° phase shift).
Formula:
Gain (Av) = − Rf / Rin
Example: If Rf = 100 kΩ and Rin = 10 kΩ,
Gain = −100000 / 10000 = −10
This means the output voltage is 10 times the input voltage and inverted.
2. Non-Inverting Op-Amp
In a non-inverting amplifier, the input signal is applied to the non-inverting terminal. The output signal is amplified without phase inversion.
Formula:
Gain (Av) = 1 + (Rf / Rin)
Example: If Rf = 20 kΩ and Rin = 5 kΩ,
Gain = 1 + (20000 / 5000) = 5
This calculator helps students, engineers, and hobbyists quickly compute op-amp gain without manual calculation errors. It is especially useful in circuit design, lab experiments, and exam preparation.
Simply choose the op-amp configuration, enter resistor values, and click Calculate.
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