An analog-to-digital converter is a converter that converts an analog signal that has been compared with a standard quantity (or reference quantity) into a discrete signal represented by binary values, abbreviated as an ADC or A/D converter. An important parameter of an analog-to-digital converter is the conversion accuracy, usually expressed in terms of the number of bits of the output digital signal. The more digital signals a converter can accurately output, the stronger its ability to distinguish input signals and the better its performance. A/D conversion generally involves four processes: sampling, holding, quantization, and encoding. In practical circuits, some processes are combined, such as sampling and holding, quantization, and encoding, which are implemented simultaneously during the conversion process
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