Op-Amp Closed-Loop Bandwidth Calculator
Calculate op-amp closed-loop -3dB bandwidth from the gain-bandwidth product (GBW), determine rise time, and verify phase margin.
Formula
BW = \frac{GBW}{A_{CL}},\quad t_r = \frac{0.35}{BW}
Reference: Texas Instruments, "Op Amp Applications Handbook"
How It Works
Operational amplifiers (op-amps) have a fundamental performance characteristic called gain-bandwidth product (GBP), which represents the maximum frequency at which the amplifier can maintain a specific gain. The closed-loop bandwidth is calculated by dividing the op-amp's gain-bandwidth product by the desired closed-loop gain, representing the maximum frequency at which the amplifier can accurately amplify signals.
Worked Example
Problem: Calculate the closed-loop bandwidth for a non-inverting amplifier with a GBW of 1 MHz and a closed-loop gain of 10 Solution: 1. Gain (Av) = 10 2. GBW = 1 MHz 3. Closed-Loop Bandwidth = GBW/Av = 1 MHz / 10 = 100 kHz 4. Rise Time = 0.35 / BW = 0.35 / (100 kHz) = 3.5 microseconds
Practical Tips
- ✓Always check manufacturer's datasheet for precise GBW specifications
- ✓Lower gains provide wider bandwidth
- ✓Consider temperature and component variations in design
Common Mistakes
- ✗Assuming linear bandwidth across all gains
- ✗Neglecting the GBW limit when designing amplifier circuits
- ✗Not accounting for actual op-amp specifications
Frequently Asked Questions
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