SarwarMughal Posted April 30, 2005 Report Share Posted April 30, 2005 I need a quick solution to this problem , could anyone help me ? Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 30, 2005 Report Share Posted April 30, 2005 Hi Sarwar,Welcome to our forum. ;DThe design of a filter depends entirely on its frequency that you didn't mention.150Hz? 3kHz? 30Mhz? 3Ghz?Instead of a filter it might be easier to make the source more linear so it doesn't clip or produce 3rd harmonic distortion. What is it?If the source is a digital square-wave it would be easy to completely eliminate its 3rd harmonic by over-sampling it with a staircase type of waveform and allow you to change its frequency very quickly.A filter could be a simple RC network and have a shallow slope without much 3rd harmonic attenuation, or have many poles like an 8-stage switched capacitor filter IC that will also completely eliminate the 3rd harmonic and allow you to change its frequency very quickly. You don't say how much attenuation you need. Quote Link to comment Share on other sites More sharing options...
MP Posted May 1, 2005 Report Share Posted May 1, 2005 Sarwar,The discussion of blocking the third harmonic is usually associated with mains voltages and motors. Is this what you are referring to?MP Quote Link to comment Share on other sites More sharing options...
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