SBOA580 November   2023 INA1620 , OPA1602 , OPA1604 , OPA1611 , OPA1612 , OPA1612-Q1 , OPA1622 , OPA1632 , OPA1655 , OPA1656 , OPA209 , OPA210 , OPA211 , OPA211-EP , OPA2209 , OPA2210 , OPA2211-EP , OPA2211-HT , OPA2211A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Violating Linear Operating Ranges
  6. 3How to Measure THD+N of an Op Amp
    1. 3.1 Non-Inverting Measurement
    2. 3.2 Inverting Measurement
    3. 3.3 Observations
    4. 3.4 Interpreting THD + N Curves
  7. 4Summary
  8. 5References
  9. 6Appendix

Abstract

This application note discusses how to measure total harmonic distortion plus noise or THD + N of an operational amplifier, how to interpret the measurements, and the fundamental principles of THD + N.