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I am trying to inject noise into the Voltage Source as shown in this thread. The NOISE function looks like this: V=(white(2e6*time)/10). I am new to LTSpice. How to actually use the white function? Where do I go in the LTSpice tool to enter this function?

I can right click on the voltage source and I see this window. Where do I enter the white function?

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2 Answers 2

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Use the behavioral voltage source and apply the white() function there. Hit F2, then look for "bv" as the item in the dialog box. Drop that puppy down on the schematic. Do NOT use the regular voltage source for this.

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  • \$\begingroup\$ @user1406716 I'm glad that helped! \$\endgroup\$
    – jonk
    Nov 11, 2016 at 7:50
  • \$\begingroup\$ If you can, use the BI, or BI2, which would save you one node in the matrix solver. \$\endgroup\$
    – a concerned citizen
    Nov 11, 2016 at 11:54
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If you are looking for a voltage noise source and/or current noise source for use with LTspice you can download such noise sources on my GitHub page https://github.com/yildi1337/LTspiceNoiseSources.

Below you can find screenshots of two examples:

Example with voltage noise source Example with current noise source

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    \$\begingroup\$ I see you keep on answering with this on several questions, please don't spam. Besides, this is about .TRAN, not .NOISE. \$\endgroup\$
    – a concerned citizen
    Jul 10, 2022 at 15:25
  • \$\begingroup\$ I haven't used the sources in a time-domain simulation (.TRAN) yet. But they are working fine in a .NOISE simulation. \$\endgroup\$
    – Charly
    Jul 10, 2022 at 15:55

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