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Non-Inverting Op-Amp Gain Equation:
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The non-inverting operational amplifier configuration provides a voltage gain greater than or equal to 1, with the input signal applied to the non-inverting terminal. This configuration offers high input impedance and stable performance.
The calculator uses the non-inverting op-amp gain equation:
Where:
Explanation: The gain is determined by the ratio of feedback resistor to input resistor plus one. This configuration always provides gain ≥1 and maintains the same phase as the input signal.
Details: Accurate voltage gain calculation is essential for designing amplifier circuits, signal conditioning systems, and ensuring proper signal amplification in electronic applications.
Tips: Enter feedback resistor (Rf) and input resistor (Ri) values in ohms. Both values must be positive and non-zero. The calculator will compute the voltage gain.
Q1: What is the minimum gain for a non-inverting op-amp?
A: The minimum gain is 1 (when Rf = 0 or Ri = ∞), which corresponds to a voltage follower configuration.
Q2: Can the gain be less than 1?
A: No, the non-inverting configuration always provides gain ≥1. For gains less than 1, use an inverting configuration or voltage divider.
Q3: What are typical resistor values used?
A: Typical values range from 1kΩ to 1MΩ. The ratio Rf/Ri determines the gain, so choose values that provide the desired gain while considering power and noise.
Q4: Does this formula assume ideal op-amp conditions?
A: Yes, this formula assumes infinite input impedance, zero output impedance, and infinite open-loop gain. Real op-amps may have slight deviations.
Q5: What is the input impedance of this configuration?
A: The input impedance is very high (typically >1MΩ for modern op-amps), making it suitable for applications requiring minimal loading of the source.