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Successive approximation type analog-to-digital converter, calibration method thereof and electronic equipment

An analog-to-digital converter, successive approximation technology, applied in the direction of analog/digital conversion calibration/test, analog/digital conversion, code conversion, etc., can solve the problem of reducing the size of the analog-to-digital converter, achieve size reduction, calibration The results are accurate

Pending Publication Date: 2021-01-08
SHANGHAI AWINIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the size of the analog-to-digital converter in the prior art needs to be further reduced

Method used

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  • Successive approximation type analog-to-digital converter, calibration method thereof and electronic equipment
  • Successive approximation type analog-to-digital converter, calibration method thereof and electronic equipment
  • Successive approximation type analog-to-digital converter, calibration method thereof and electronic equipment

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Embodiment Construction

[0034] As in the background art, since an additional calibration capacitor array needs to be added to implement calibration, the size of the successive approximation analog-to-digital converter is relatively large.

[0035] The invention provides a new successive approximation analog-to-digital converter, which can be calibrated through digital calculation without adding an additional calibration capacitor array, and the implementation method is simple.

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application. In the case of no conflict, the following embodiment...

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Abstract

The invention discloses a successive approximation type analog-to-digital converter, a digital calibration method thereof and electronic equipment, and the analog-to-digital converter comprises a DACmodule which is used for sampling an analog input signal and converting the analog input signal into an analog output voltage; a comparator which is used for comparing the analog output voltage with the reference voltage and outputting a comparison result; a logic control module which is connected with the output end of the comparator and is used for carrying out successive approximation control on the DAC module according to the comparison result so as to enable the comparator to successively output the comparison result and outputting a corresponding transcoding signal according to the multiple comparison results after the successive approximation control is completed; and a digital calibration module which is used for carrying out calibration calculation on the comparison result or thetranscoding signal according to the weight error delta q of each bit and then outputting a calibrated transcoding signal, and delta q is equal to W-Widea-Woffset. The analog-to-digital converter is high in conversion performance.

Description

technical field [0001] The present application relates to the technical field of integrated circuits, in particular to a successive approximation analog-to-digital converter, a calibration algorithm thereof, and an electronic device. Background technique [0002] A successive approximation analog-to-digital converter (Successive Approximation Register Analog Digital Converter, SARADC) has the advantages of low delay and low power consumption, and is widely used in various fields. At present, most of the high-precision successive approximation analog-to-digital converters use a binary capacitor array structure. By successively comparing the input voltage signal and the voltage value generated by the capacitor array, from high to low, the digital code corresponding to the input signal is obtained. The accuracy of the SARADC is limited by the noise and capacitance mismatch of each block. Among them, the capacitance mismatch is determined by the integrated circuit manufacturing...

Claims

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Application Information

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IPC IPC(8): H03M1/10H03M1/46
CPCH03M1/1009H03M1/1038H03M1/462H03M1/466Y02D10/00Y02D30/70
Inventor 吴文杰程涛
Owner SHANGHAI AWINIC TECH CO LTD