Op Amp Stability Analysis and Plotting Loop Gain in LTspice

Jul 15 2026

Topics include:

  • Building intuition with a step response
  • Recognizing ringing and peaking as signs of low phase margin
  • Adding the elements needed to open the loop and inject a signal to plot loop gain
  • Verifying DC operating points are unchanged
  • Plotting loop gain
  • Annotating phase margin automatically
  • Measuring phase margin manually with cursors

Op Amp Stability Analysis and Plotting Loop Gain in LTspice

Jul 15 2026

Topics include:

  • Building intuition with a step response
  • Recognizing ringing and peaking as signs of low phase margin
  • Adding the elements needed to open the loop and inject a signal to plot loop gain
  • Verifying DC operating points are unchanged
  • Plotting loop gain
  • Annotating phase margin automatically
  • Measuring phase margin manually with cursors
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