Analysis of integral capacitance characteristics in integral ADC circuit

As a bridge connecting the analog world and the digital world, the analog-to-digital converter(ADC) plays an important role in many scientific fields such as communication, medical treatment and instrument measurement. To date, ADCs are rich in variety. And different types of ADC devices are required for different application needs. Among them, the integral ADC is mainly used in the field of low-speed precision measurement, such as digital multimeter, because of its simple working principle, high resolution and low power consumption. According to the inherent disadvantages of the integral analog-to-digital converter - the conversion accuracy depends on the integration time, this paper aims to analyze the influence of the charge and discharge characteristics of the integral capacitor on the acquisition and measurement accuracy of the integral ADC, analyze the charge and discharge characteristics of different types of integral capacitors through the experimental study and propose the recommendations for the selection of the integration circuit in practical applications.