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Op Amp Gain Formula:
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The operational amplifier (op amp) gain represents the amplification factor of the input signal in an inverting amplifier configuration. It determines how much the output voltage changes relative to the input voltage.
The calculator uses the op amp gain formula:
Where:
Explanation: The gain is determined by the ratio of feedback resistance to input resistance, with the negative sign indicating 180-degree phase shift (inversion) of the output signal.
Details: Accurate gain calculation is crucial for designing amplifier circuits, signal processing systems, and ensuring proper signal amplification in electronic applications.
Tips: Enter feedback resistance and input resistance in ohms (Ω). Both values must be positive and non-zero. The result is dimensionless and represents the voltage gain.
Q1: Why is the gain negative?
A: The negative sign indicates that the output signal is inverted (180-degree phase shift) relative to the input signal in an inverting amplifier configuration.
Q2: What are typical gain values?
A: Gain values typically range from 1 to 1000 or more, depending on the application. Common values are between 10 and 100 for general-purpose amplification.
Q3: What happens if R_in is larger than R_f?
A: If R_in > R_f, the gain magnitude will be less than 1, resulting in signal attenuation rather than amplification.
Q4: Are there limitations to this formula?
A: This formula assumes ideal op amp characteristics (infinite input impedance, zero output impedance, infinite gain). Real op amps have limitations that may affect performance.
Q5: Can this calculator be used for non-inverting amplifiers?
A: No, this calculator is specifically for inverting amplifier configuration. Non-inverting amplifiers use a different gain formula: Gain = 1 + (R_f / R_in).