Calibration circuit of analog-digital converter and analog-digital converter

Abstract

The invention provides a calibration circuit of an analog-to-digital converter and the analog-to-digital converter. The calibration circuit comprises a calibration module and a comparison module, the capacitor array is used for receiving a control signal sent by the processor and sending a voltage signal output based on the control signal to the comparison module; wherein the control signal is determined by the processor based on the current to-be-calibrated capacitor in the capacitor array; the comparison module is used for comparing the voltage signal with a reference voltage signal and sending a comparison result to the processor; and the processor is used for controlling the voltage signal output by the capacitor array to be the same as the reference voltage through the calibration module when determining that the voltage signal is different from the reference voltage signal based on the comparison result. According to the calibration circuit of the analog-to-digital converter and the analog-to-digital converter, analog calibration of the current to-be-calibrated capacitor is achieved, complex logic needed by digital calibration is avoided, and the capacitor calibration process is simplified.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to a calibration circuit of an analog-to-digital converter and an analog-to-digital converter. Background technique [0002] An analog-to-digital converter (Analog to Digital Converter, ADC) is an electronic device that can convert an analog signal in the real world into a digital signal in an electronic system. In real life, almost all signals are analog signals, and analog signals are signals that are continuous in time and amplitude. It would be difficult to do more complex processing of these signals directly in the analog domain. With the increasing maturity of digital signal processing technology, in order to make the processing of analog signals more convenient and accurate, the first step in processing them is often to convert them into digital signals first, and then convert the signal processing to digital signal processing. level. This method of replacing traditional ...

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Problems solved by technology

[0003] In related technologies, an analog-to-digital converter is used to convert an analog signal to a digital signal, and in order to improve the performance of the analog-to-digital converter, a successive approximation (Successive Approximation Register, SAR) analog-to-digital converter is usually used for analog-to-digital conversion, but The capacitor array in the successive approximation analog-to-digital converter is prone to mismatch during the manufacturing process, so the capacitor array of the successive approximation analog-to-digital converter needs to be calibrated to improve the accuracy of the successive approximation analog-to-digital converter

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