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

4 Summary

Total harmonic distortion plus noise or THD + N is a vast subject that presents challenges in applications such as power, audio, instrumentation amplification and many others. Op amps are often one component of a much larger system that contribute to the overall THD + N. Texas Instruments audio op amps such as the OPA1656 provide phenomenally low THD + N and are great choices when designing a signal chain that requires ultra low total harmonic distortion plus noise.