ADC circuit and control method thereof

Abstract

The invention provides an ADC circuit and a control method thereof, and belongs to the technical field of electronics. The ADC circuit at least comprises an analog-to-digital conversion module and a calibration module. The analog-to-digital conversion module is configured to output a corresponding first digital signal based on a sampled first signal when a first control signal is at a first level during conversion, and output a corresponding second digital signal based on a sampled second signal when the first control signal is at a second level; the calibration module is connected with the analog-to-digital conversion module, and is configured to determine a calibration code based on a mismatch code obtained during a calibration period, and perform calibration code compensation on the analog-to-digital conversion module; wherein the first control signal is subjected to level switching during a sampling period. According to the invention, continuous calibration of the differential mode and the single-ended mode of the analog-to-digital conversion module can be realized.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to an ADC circuit and a control method thereof. Background technique [0002] In the field of electronic technology, an analog-to-digital converter (Analog-to-Digital Converter, ADC) circuit can be used for signal measurement to convert an analog signal into a digital signal. [0003] In some application scenarios, it is necessary to support continuous measurement of differential signals and single-ended signals of different input channels. The current conventional practice is to process the differential signal and the single-ended signal respectively by using the differential mode and the single-ended mode by switching the working mode of the ADC. [0004] However, the existing ADC cannot continuously operate two working modes. For example, the ADC needs to be reconfigured after the differential signal is processed, and then the single-ended signal is processed. There ...

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Problems solved by technology

[0004] However, the existing ADC cannot run two working modes continuously. For example, the ADC needs to be reconfigured after the differential signal is processed, and then the single-ended signal is processed. There will be redundant mode switching time in the middle, which cannot be continuously run

And when the ADC accuracy requirements are relatively high, the ADC needs to be calibrated, and the traditional method cannot meet the continuous calibration of the ADC differential mode and single-ended mode.

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