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How to make a noise source in pspice?

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ZengLei

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i want to analyze the noise performance of my circuit,but i can't find any noise sources in pspice and i need pink noise and white noise source~~

so ,how to make it in pspice?

thanks
 

A resistor with a buffer amplifier can act as white noise source in AC analysis, a 50 ohms resistor generates 1 nV/√Hz. Pink noise would require an additional RC ladder filter as in a real world noise source or a √s ABM block.
 

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