A delta-sigma modulator is an electronic device used to convert an analog signal into a digital signal. It works by oversampling the input signal and using a feedback loop to reduce quantization noise. This process allows for high-resolution digital representation of the original analog signal. The modulator typically consists of an integrator, a quantizer, and a feedback mechanism. By continuously adjusting the output based on the difference between the input and the feedback, the delta-sigma modulator achieves better accuracy and noise performance. This technology is widely used in applications like audio processing and data conversion.