SBOA610 January   2025 OPA690 , OPA695

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Background
    1. 1.1 Slew Rate and Slew Boost Definitions
    2. 1.2 Slew Rate Limits for Voltage Feedback Amplifiers
    3. 1.3 Slew Rate Internals for Current Feedback
  5. 2Slew Rate Data Using the OPA690
  6. 3Slew Rate Data Using the OPA695
  7. 4Summary
  8. 5References

4 Summary

For voltage feedback amplifiers it is important to be aware that slew rate is directly related to the input differential voltage. For high gain configurations, the slew rate performance of a voltage feedback amplifier can reduce dramatically compared to unity gain specifications.

For applications that need both high gain and large slew rate, a simple solution is to use a current feedback amplifier. As demonstrated by the measurements in this document, the unique architecture of current feedback amplifiers allows them to maintain their slew rate performance even with the input differential voltage is very small.