Frequency dithering enhances high-performance ADCs


Posted on Apr 2, 2012

Since the late 1970s, designers have successfully improved the effective resolution and spurious performance of A/D converters by adding ditheruncorrelated noiseto a converter`s input and then using DSP techniques to average out noise from the converted data. The most common dithering method adds random-amplitude noise to an A/D converter`s input signal. Although this method works, the added noise includes large random peak values. To keep the A/D converter`s input out of the saturation region, a designer must know both the peak signal and the peak dither levels.






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