AFE (Analog Front End) refers to the circuit module located between the analog signal input and the digital signal processing system. AFE usually integrates a variety of functional modules, such as analog-to-digital converter (ADC), amplifier, reference source, excitation circuit and modulation and demodulation circuit, forming a highly integrated analog system. Its main task is to pre-process the original signal from the sensor or other analog signal source, including amplification, filtering, conditioning and conversion, to ensure the quality of the signal, so that it is more suitable for subsequent digital signal processing or storage.

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