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About This Tool
Determine operational amplifier closed-loop voltage gain and high-frequency cutoff bandwidth directly in your browser. Analog circuit designers must balance closed-loop gain against the op-amp gain bandwidth product (GBWP) to ensure preamplifiers and active filters maintain adequate frequency response without gain peaking or phase distortion.
This calculator evaluates both non-inverting and inverting negative feedback topologies. In non-inverting configuration, voltage gain evaluates to Av = 1 + (Rf / Rin). In inverting configuration, voltage gain evaluates to Av = Rf / Rin. The calculator converts linear voltage gain into decibels using 20 × log10(Av) and calculates the closed-loop -3dB cutoff frequency in kilohertz using (GBWP in MHz × 1000) / Av.
For example, configuring a non-inverting amplifier with an input resistor Rin = 10 kΩ, a feedback resistor Rf = 100 kΩ, and an operational amplifier with a GBWP of 10 MHz yields a closed-loop gain of 1 + (100 / 10) = 11.00 (20.83 dB) and a -3dB cutoff frequency of (10 × 1000) / 11 ≈ 909.09 kHz.
All circuit calculations execute locally in client-side JavaScript. No resistor values, component specs, or schematic parameters leave your browser.
How to Use
- 1
Select your op-amp amplifier topology (Non-Inverting or Inverting).
- 2
Enter the input resistance Rin and feedback resistance Rf in kilohms (kΩ).
- 3
Specify the operational amplifier Gain Bandwidth Product (GBWP) in megahertz (MHz).
- 4
Review the calculated closed-loop voltage gain ratio, decibel gain (dB), and -3dB cutoff frequency in kHz.
Frequently Asked Questions
What is the formula difference between non-inverting and inverting op-amp gain?
A non-inverting amplifier provides closed-loop gain Av = 1 + (Rf / Rin), whereas an inverting amplifier provides magnitude gain Av = Rf / Rin (with a 180-degree phase shift).
Why does higher voltage gain reduce amplifier cutoff frequency?
Most general-purpose op-amps use dominant-pole internal compensation where open-loop gain rolls off at -20 dB/decade, making the product of closed-loop gain and bandwidth a constant (GBWP).
Are any circuit parameters sent to an external server?
No. All calculations run strictly client-side inside your local browser runtime.