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How to design filter for sine wave inverter

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engr.waqas

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How to design filter

I am designing a sine wave inverter.I have used a full bridge of 4 Mosfets PIC microcontroller for PWM.
I have achieved PWM but i don't know how to design a filter to extract 50 HZ sine wave from 20 KHZ PWM.
Please help
 

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