AnsweredAssumed Answered

Filter Wizard / SPICE noise analysis inconsistency

Question asked by MPU on Jun 29, 2016
Latest reply on Jul 14, 2016 by MPU

Hello,

 

While attempting to simulate some filters designed with the Filter Wizard in LTSpice, I have noticed that the noise values LTSpice gives me are about 10x higher than what the Filter Wizard displays.

 

The following image shows the LTSpice simulation run directly from the NoiseAnalysis.cir included in the design package output from Filter Wizard:

ltspice.png

And this image is what the Filter Wizard shows for the same filter:

filterwizard.png

Other than the difference between the Y axis scaling, the shape generally matches - but the values are look to be about 10x greater in LTSpice.

 

Am I doing something wrong? Which graph is correct? Is there some way for me to make them match?

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