SLOA332 july   2023 LMV821-N , LMV831 , OPA2991 , OPA345 , OPA376 , OPA376-Q1 , OPA377 , OPA377-Q1 , OPA4991 , OPA991 , TL074 , TLV376 , TLV9001 , TLV9002 , TS321

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Slew Rate Definition
    1. 1.1 Virtual Ground and Slew Rate
  5. 2Bipolar Op Amp Slew Rate Example
  6. 3CMOS Op Amp Slew Rate Example
    1. 3.1 Slew Boost Example 1
    2. 3.2 Slew Boost Example 2
    3. 3.3 Slew Boost Summary
  7. 4Four Methods to Determine Boost or No Boost Using the Data Sheet
  8. 5Slew Rate Dependencies on Circuit Signal Levels and Op Amp Gain Set by Feedback Network
  9. 6How Much Output Slew Rate is Needed to Support a Sine Wave or Other Non-step Inputs
  10. 7Stability Also Plays a Role in Observed Slew Rate
  11. 8Summary
  12. 9References

8 Summary

The slew rate parameter in the data sheet is typically the quickest possible output rate change in V/µs. For low-power op amps, the units can be V/ms. Slew rate is reduced in applications with small inputs and high gains. Input difference voltage, VID, is needed to achieve an output slew rate. Achieving a faster SR requires a larger VID. However, a larger VID makes the virtual ground op amp concept less true, leading to a possible increase in signal distortion. Selecting an op amp with much higher slew rate and bandwidth than needed, to achieve lower signal distortion, is the best option.