Slew-rate of Op Amps in practice

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SUMMARY

The discussion centers on the discrepancy between the specified slew rate of an operational amplifier (op-amp) and the measured value in practical applications. The op-amp in question has a specified maximum slew rate of 1V/µs, but the user measured it at approximately 0.4V/µs using a step input. Key factors affecting the measured slew rate include the slew rate of the step input generator, circuit configuration, power supply voltages, and output loading, particularly capacitive loads.

PREREQUISITES
  • Understanding of operational amplifier specifications
  • Knowledge of circuit configuration and its impact on performance
  • Familiarity with step input signal generation
  • Basic principles of power supply voltage effects on op-amps
NEXT STEPS
  • Investigate the effects of capacitive loading on op-amp performance
  • Learn about the design considerations for step input generators
  • Research methods to measure slew rate accurately in op-amps
  • Explore the impact of power supply voltage variations on op-amp behavior
USEFUL FOR

Electronics engineers, students studying analog circuits, and anyone involved in the design and testing of operational amplifiers will benefit from this discussion.

NewtonianAlch
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Homework Statement



We have a given op-amp, the data sheet has a specified slew-rate value for it, but in practice it happens to be a lot lower.

I essentially used a step-input to determine the slew-rate and found it to be much lower. I can't remember the exact values now. I think The maximum slew-rate was 1V/us, but I calculated it based on the square wave input (step) to be like 0.4V/us, why would this be?

Thanks
 
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What its the slew rate of your step input generator?
 
Slew rate is also a function of circuit configuration, in particular the power supply voltages and output loading, especially if capacitive.
 

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