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Output Voltage (Vout)
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Amplifier Gain (Av)
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Gain in dB
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Input Current
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An inverting amplifier is an operational amplifier configuration where the input signal is applied to the inverting (-) terminal, and the output is 180 degrees out of phase with the input. The gain is determined by the ratio of feedback resistor to input resistor.
The voltage gain of an inverting amplifier is calculated using the formula: Av = -R2/R1, where R2 is the feedback resistor and R1 is the input resistor. The negative sign indicates phase inversion.
If the calculated output voltage exceeds the supply voltage limits (Vee to Vcc), the op-amp will saturate and clip the output at the supply rail voltages. This causes distortion in the output signal.
The inverting amplifier inverts the phase of the input signal by 180 degrees. This means a positive input voltage produces a negative output voltage, and vice versa, due to the feedback configuration.
The input impedance of an inverting amplifier is approximately equal to the input resistor R1, which is much lower than the input impedance of a non-inverting amplifier configuration.
Choose resistor values based on desired gain (R2/R1 ratio), input impedance requirements, and power considerations. Typical values range from 1kΩ to 1MΩ, with higher values reducing power consumption but increasing noise susceptibility.
Yes, an inverting amplifier can have a gain less than 1 (attenuation) when the feedback resistor R2 is smaller than the input resistor R1. This creates an inverting attenuator circuit.
The bandwidth of an inverting amplifier depends on the op-amp's gain-bandwidth product and the closed-loop gain. Higher gains result in lower bandwidth due to the gain-bandwidth trade-off in op-amp circuits.