Op-Amp Non-Inverting Amplifier
A non-inverting op-amp amplifier takes its input at the positive terminal and feeds a portion of its output back to the negative terminal. The two feedback resistors set the closed-loop voltage gain, which is one plus the feedback resistor divided by the resistor to ground. This configuration has high input impedance and does not invert the signal. The dual supplies in this schematic allow the output to swing around ground for an AC signal. In a single-supply circuit, bias the input and feedback network around a mid-supply reference instead. Choose an op-amp that supports the supply rails, input range, bandwidth, and load required by the actual application.
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Scenario
Non-inverting voltage amplifier
Key decisions
- Topology: Connect the input to the non-inverting terminal.
- Gain: Use feedback and ground resistors to set closed-loop gain.
- Supply: Decouple both positive and negative rails.
When to reuse this
Use for a basic dual-supply non-inverting op-amp gain stage.
Frequently asked questions
How is non-inverting gain calculated?
Is the output inverted?
Why add decoupling capacitors?
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