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Author Topic: Flicker Noise Modeling  (Read 192 times)
JoeMax
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« on: July 07, 2017, 01:21:47 PM »

Often macromodels of regulators are not available that can provide a spectral noise density of the regulator output.  To get around this, noise generator models can be built, such as a gained and buffered resistor for a flat noise.  A 1/f^2 spectral noise generator that can be scaled to fit many regulator noise profiles can be generated by simply single pole filtering a high noise floor, and adding that to the appropriate flat noise floor. 

But, many regulators have a fundamentally 1/f shaped low frequency or flicker noise profile.  Instead of dropping 20dB per decade, the spectral voltage noise density is dropping about 10dB per decade.  This is not as easily emulated.  A complex set of RC filters can be summed to approximate it, but it is a lot of trouble and not very accurate.  Does anyone know a better way, such as a polynomial or behavioral model approach, that can more accurately and easily model a 1/f flicker noise profile?
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