What output filter is needed for (quasi-)sinusoidal output ?

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ee01akk

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12V dc-ac inverters

Hi,
I'm building an inverter circuit as part of a project I'm doing at college. I'm using PWM to control the inverter switches and eliminate low order harmonics. Does anyone know what type of output filter (passive or active) I need to build to get a quasi-sinusoidal or sinusoidal output?
 

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