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OP-AMP conversion square-wave to sine-wave

Ramin Tavassoli
Intellectual 645 points

I have a 400 Hz Square wave signal. I must convert it to a pure 400 Hz sine wave.

I have seen documents such as https://www.ti.com/lit/an/snoa665c/snoa665c.pdf?ts=1700566128534, and https://www.ti.com/lit/wp/snoa839/snoa839.pdf?ts=1700542474484&ref_url=https%253A%252F%252Fduckduckgo.com%252F

But they do not address my design challenge directly since there is an Excel worksheet that is missing from the above document

Please provide ideas

Thank you

  • 0
    TI__Guru**** 151276 points

    Hello  Ramin,

    You are starting with a 400Hz square wave. This waveform contains a 400 Hz sine inside of it. It's already there. You just have to remove (actually greatly reduce) everything that is not a 400Hz signal. The hardest signal to remove is 400 Hz * 3 = 1200 Hz.  Send the square wave through a many pole low pass filter to reduce 400Hz * (2n+1) harmonics that are in a square wave .   

    Filter Design Tool - WEBENCH ® Circuit Designer https://webench.ti.com/filter-design-tool/