ΣΔmodulators are non-linear feedback systems that enable the implementation of high-resolution analog-to-digital converters using a coarse quantizer. This is possible because the output of the modulator is characterized by low quantization noise power in a narrow bandwidth. A high-resolution Nyquist-rate digital output is obtained after digital filtering and decimation of the modulator output. The basic principles of operation of continuous-time ΣΔ modulators are described in section 3.1.
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(2008). Continuous-Time ΣΔ Modulation. In: High-Resolution If-To-Baseband ΣΔ Adc For Car Radios. Analog Circuits And Signal Processing. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8164-4_3
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