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Error correction circuit for correcting offset error of analog-to-digital converter

A technology for analog-to-digital converters and offset errors, applied in the field of analog-to-digital converters, can solve problems affecting the accuracy of analog-to-digital converters, system gain errors, system offset errors, etc., achieve low power consumption, improve precision, and realize simple effect

Active Publication Date: 2018-04-20
WUXI I CORE ELECTRONICS
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AI Technical Summary

Problems solved by technology

Typically in any ADC there is a systematic offset error at zero scale code value and a systematic gain error at full scale code value, and these systematic errors affect the accuracy of the ADC

Method used

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  • Error correction circuit for correcting offset error of analog-to-digital converter

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Embodiment Construction

[0009] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0010] see figure 1 , the present invention provides a technical solution: an error correction circuit for offset error correction of an analog-to-digital converter, the analog-to-digital converter comprising: a correction capacitance device C E and is coupled to the correction capacitive means C E The switching device, which can be coupled to ground or some reference voltage, wherein the switching device can be selected in the hold mode will correct the capa...

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Abstract

The invention discloses an error correction circuit for correcting an offset error of an analog-to-digital converter in the technical field of the analog-to-digital converter. The analog-to-digital converter comprises a correction capacitor device CE and a switching device coupled to the correction capacitor device CE; and the switching device can be coupled to the ground or a certain reference voltage, wherein the switching device can select to connect a lower polar plate of the correction capacitor device CE to the ground (or a certain reference voltage) in a holding mode and select to connect the lower polar plate of the correction capacitor device CE a certain reference voltage (or to the ground) in a charge reallocation mode. According to the error correction circuit disclosed by theinvention, the offset error correction circuit is added in the analog-to-digital converter to achieve the correctability of positive / negative offset errors. The structure is simple to implement, the power consumption is low, and the precision of the analog-to-digital converter can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of analog-to-digital converters, in particular to an error correction circuit for offset error correction of analog-to-digital converters. Background technique [0002] In today's electronics field, analog-to-digital converters are widely used in various electronic products, such as portable battery-powered instruments. Typically in any ADC there is a systematic offset error at zero-scale code value and a systematic gain error at full-scale code value, and these systematic errors affect the accuracy of the ADC. For this reason, we propose an error correction circuit for AD converter offset error correction and put it into use to solve the above problems. Contents of the invention [0003] The object of the present invention is to provide an error correction circuit for offset error correction of an analog-to-digital converter, so as to solve the problems raised in the background art above. [0004] In or...

Claims

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Application Information

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IPC IPC(8): H03M1/10
CPCH03M1/1009
Inventor 俞小平黄坚吴志玲丁蔚
Owner WUXI I CORE ELECTRONICS
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