How to Design an Active Filter for Standard Definition Video Channels By: Steven O. Smith Keywords: Op amp, filter, PCB Abstract: The design in this article uses Fairchild Semiconductor\'s high-speed dual op amp (FHP3230) to construct a filter that fits into a small printed circuit board. Today\'s high-speed op amps make it easier to design active filters for video applications than passive inductor-capacitor (LC) filters. With the introduction of high-speed amplifiers and video filters from Fairchild Semiconductor, active filters for video channels have become a very cost-effective solution. Why use a video filter? Any interfering signal in the video band will produce some visible display distortion, which can be eliminated by using a video filter. Aliasing is a noticeable distortion in sampled video systems. Aliasing occurs when high-frequency signals outside the video band (such as external wireless transmissions or local clock signals) are aliased back into the video band through the sampling process of the analog-to-digital converter. Placing an anti-aliasing filter before the analog-to-digital converter can prevent this distortion. When a digitized video signal is reconstructed using a digital-to-analog converter, the video signal will be replicated at a higher frequency, which will also cause image distortion. This type of distortion signal can be eliminated by adding a video filter after the digital-to-analog converter.
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