SBVA094A February   2025  – July 2025 TPS7A21

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Oscilloscope Basics
  5. 2Implications of Parasitics
  6. 3Common Oscilloscope Issues
    1. 3.1 Choosing an Oscilloscope Probe
    2. 3.2 Sufficient Sampling
    3. 3.3 Visualization
    4. 3.4 Measuring Currents Using Current Probes
    5. 3.5 Bandwidth Limiting and Averaging
  7. 4Parasitic Effects on Common Measurements
    1. 4.1 Load Transients
    2. 4.2 Power Supply Rejection Ratio
    3. 4.3 Output Noise Voltage
  8. 5Summary
  9. 6References
  10. 7Revision History

5 Summary

Measurement setup is important when verifying LDO device specification accuracy. Before taking a measurement, be aware of certain measurement conditions which can give inaccurate or distorted measurement data. Be sure to use sufficient sampling to avoid aliasing and poor visualization. Limit circuit inductance with shortened cabling to reduce resonant ringing. Finally, make sure that the oscilloscope is properly adjusted to best display the measurements by adjusting the horizontal and vertical scales appropriately. Please verify measurement setup before taking a measurement on an LDO device.