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Minimum Slew Rate of Op-Amp

 

Minimum Slew Rate of Op-Amp

Minimum Slew Rate of Op-Amp

What is Slew Rate?

Slew rate is the maximum rate of change of output voltage of an op-amp.

SR = dV / dt (V/Ξs)

Minimum Slew Rate Formula

To avoid distortion:

SRmin = 2π f Vpeak
  • f = frequency of signal
  • Vpeak = peak output voltage

Why This Matters

  • If slew rate is too low, output cannot follow input
  • Signal becomes distorted (triangular instead of sine)

Example

Given:

  • f = 20 kHz
  • Vpeak = 10 V
SRmin = 2π × 20000 × 10 ≈ 1.26 V/Ξs

Required slew rate ≥ 1.26 V/Ξs

Typical Values

  • General-purpose op-amp (LM741): ~0.5 V/Ξs
  • Audio op-amps: 5–20 V/Ξs
  • High-speed op-amps: 100+ V/Ξs

Summary

The minimum slew rate depends on signal frequency and amplitude. It must be greater than SRmin to avoid distortion.

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