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Bandwidth (fc)
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Noise Gain (Kn)
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Closed-Loop Gain
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Gain-Bandwidth Product
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Calculated R2
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Non-inverting amplifiers provide higher bandwidth for the same gain compared to inverting amplifiers. The noise gain for non-inverting is (R1+R2)/R2, while for inverting it's (R1+R2)/R1, affecting the overall bandwidth calculation.
The bandwidth (fc) is calculated as the unity-gain frequency (fu) divided by the noise gain (Kn): fc = fu / Kn. This represents the -3dB frequency where the gain starts to roll off.
The gain-bandwidth product (GBW) is a constant for a given op-amp, equal to the product of gain and bandwidth at any frequency. It determines the maximum usable frequency for a specific gain requirement.
Resistor values should be chosen based on your desired gain, input impedance requirements, and noise considerations. Typical values range from 1kΩ to 1MΩ, with lower values providing better noise performance but higher power consumption.
Noise gain determines the bandwidth of the amplifier and is always positive, regardless of the signal gain. For inverting amplifiers, the signal gain can be negative while the noise gain is always (R1+R2)/R1.
This is due to the constant gain-bandwidth product of op-amps. As you increase the gain, the bandwidth must decrease proportionally to maintain the same GBW product, which is a fundamental limitation of the op-amp's internal compensation.
The required bandwidth depends on your signal frequency and desired accuracy. As a rule of thumb, the op-amp bandwidth should be at least 10 times higher than the highest signal frequency to maintain good performance.