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Calibration device and calibration method for gain error of SAR type ADC

A technology of gain error and calibration device, which is applied in signal transmission systems, instruments, electrical components, etc., can solve problems such as SAR ADC gain error, and achieve the effect of improving conversion accuracy and reducing gain error

Active Publication Date: 2020-05-19
XIAN MICROELECTRONICS TECH INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantage that the existing calibration device cannot calibrate the gain error, and provide a calibration device and calibration method for the gain error of the SAR ADC

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  • Calibration device and calibration method for gain error of SAR type ADC
  • Calibration device and calibration method for gain error of SAR type ADC
  • Calibration device and calibration method for gain error of SAR type ADC

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Embodiment Construction

[0035] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0036] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...

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Abstract

The invention discloses a calibration device and calibration method for gain errors of an SAR type ADC, and belongs to the field of ADC conversion gain error correction. According to the calibration device, a gain error calibration capacitor array is introduced to calibrate the gain error, such that the gain error can be effectively reduced, and the conversion precision of the ADC is improved. Thegain error calibration technology has bipolar gain error calibratability; the gain error calibration has calibration precision adjustability, and gain errors of different polarities and amplitudes can be adjusted. According to the calibration method provided by the invention, normal AD conversion is not influenced during calibration.

Description

technical field [0001] The invention belongs to the field of correction of ADC conversion gain errors, in particular to a calibration device and a calibration method for gain errors of SAR ADCs. Background technique [0002] As a bridge between analog and digital, ADC is widely used in military and civilian fields. Its main structures include: pipeline type, double integral type, flash type, Sigma-delta type and SAR type. In engineering applications, according to the requirements of accuracy, speed, power consumption and reliability, select the appropriate type of ADC. Due to its simple structure and low power consumption, SAR ADC is widely used in portable devices, ultra-long standby devices, etc. There are many ways to realize the DAC in the SAR ADC, including: voltage scaling type, current scaling type, and charge scaling type. Charge-scaled ADCs use a switched-capacitor structure. Therefore, the matching and linearity of capacitance limit the accuracy of AD conversion...

Claims

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Application Information

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IPC IPC(8): H03M1/38
CPCH03M1/38
Inventor 李婷张先娆徐晚成吴龙胜
Owner XIAN MICROELECTRONICS TECH INST
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