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Info about PWM output spectrum calculation

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amriths04

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1)could you please lead me to some good references which deals with calculation of output spectrum of a pwm-modulated signal.
2)I want to know how to take fft of a pwm-modulated signal, since it has infinite frequency components and there can be fft-artefacts(fold-backs). What windows must be used?
 

fft of pwm

Here is one of the articles on this subject :
 

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