LTspice .NOISE Simulation Setup and Configuration

Jul 15 2026

Topics include:

  • Verifying an AC simulation before converting to noise simulation
  • Configuring a .noise directive with an output node and input source
  • Plotting output noise density
  • Confirming the frequency sweep captures all of the noise
  • Plotting individual component noise contributions with Pick Visible Traces
  • Plotting circuit gain
  • Integrating to find RMS noise
  • Understanding how uncorrelated noise sources add in root-sum-square

LTspice .NOISE Simulation Setup and Configuration

Jul 15 2026

Topics include:

  • Verifying an AC simulation before converting to noise simulation
  • Configuring a .noise directive with an output node and input source
  • Plotting output noise density
  • Confirming the frequency sweep captures all of the noise
  • Plotting individual component noise contributions with Pick Visible Traces
  • Plotting circuit gain
  • Integrating to find RMS noise
  • Understanding how uncorrelated noise sources add in root-sum-square
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