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What Does Small Signal Analysis Means

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Hi Everyone

I was reading papers about buck converters control systems and come across the term, small signal analysis, can anyone tell me what that actually means ?

Regards,
Jeffrey
 

It means an ac simulation of a small input signal (e.g. 1mVeff) around a fixed DC operating point. Mostly used for gain/phase vs. frequency, gain vs. DC operating point, output impedance measurement etc.
 

When having small variation of the voltage / current, small signal circuit analyses might apply where the transistors can be considered linear
 

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