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SAR and Delta-Sigma ADC Fundamentals
Understanding Delta-Sigma Data Converters
To start with, what issues do I need to consider when designing my antialiasing filter? A: A major benefit of oversampling converters is that the filtering required to prevent aliases can be quite simple. The input signal is sampled at F ms , the modulator input sampling rate, which is much faster than twice the maximum input signal frequency the Nyquist rate. Any signals or noise in those ranges get aliased down to the bandwidth of interest [ 0,fb ] via the sampling process; the decimation filter, which works only on the digitized samples, cannot be of any help attenuating these signals. A: Not quite. The only signal input of concern for aliasing is normally just noise from sensors and circuitry preceding the converter. The noise is usually low enough for a simple RC filter to suffice as an anti-alias filter.
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Analog Integrated Circuits and Signal Processing. Three different modulator structures and six different types of switched-current circuits were used with an emphasis on low-voltage operation. Eight 3. Unable to display preview. Download preview PDF. Skip to main content.