In order to properly simulate a low pass filter, a small signal equivalent circuit must be generated. Refer to the figure below. In addition, the parasitic resistance from the filter printed circuit board traces must be calculated and simulated. This has a first order effect on the attenuation of the filter.
Refer to application note AN-863 for more details. For other questions not addressed by the Knowledge Base, please submit a technical support request.


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Application Notes & White Papers
AN-863 Power Filter Recommendations for SMD Oscillators Application Note PDF 192 KB