Delta-sigma modulation

Common card · No. 206631

Delta–sigma (ΔΣ; or sigma–delta, ΣΔ) modulation is an oversampling method for encoding signals into low bit depth digital signals at a very high sample-frequency as part of the process of delta–sigma analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). Delta–sigma modulation achieves high quality by utilizing a negative feedback loop during quantization to the lower bit depth that continuously corrects quantization errors and moves quantization noise to higher frequencies well above the original signal's bandwidth. Subsequent low-pass filtering for demodulation easily removes this high-frequency noise and time averages to achieve high accuracy in amplitude, which can be ultimately encoded as pulse-code modulation (PCM). Both ADCs and DACs can employ delta–sigma modulation. A delta–sigma ADC (e.g., Figure 1 top) encodes an analog signal using high-frequency delta–sigma modulation and then applies a digital filter to demodulate it to a high-bit digital output at a...

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