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Capacitor array weight calibration method

A capacitor array and weighting technology, which is applied in analog/digital conversion calibration/testing, electrical components, electrical signal transmission systems, etc., can solve problems such as complex calibration methods, small application range, and large chip area

Pending Publication Date: 2018-10-09
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a method for calibrating the weight of a capacitor array to solve the problems in the prior art that the calibration method is complicated, occupies a large chip area, and has a small application range

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Embodiment Construction

[0027] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0028] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0029] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

The invention discloses a capacitor array weight calibration method, which comprises the steps of: acquiring calibrated weights of a capacitor on all bits before the L-th bit, wherein the L is a natural number greater than or equal to 2; acquiring bit values on all bits before the L-th bit, wherein the bit values are acquired according to a law of charge conservation; multiplying the weight of thecapacitor on each bit before the L-th bit by the bit value on the corresponding bit, and regarding a sum of all products as the calibrated weight of the capacitor on the L-th bit. Then, he weights ofthe capacitors on all bits are calibrated in sequence by adopting the capacitor array weight calibration method. After the weights of the capacitor array are calibrated by adopting the capacitor array weight calibration method, the entire capacitor array can show good linearity even if a mismatch exists among the capacitors, and the capacitor array weight calibration method is simple in calculation and has wide application range.

Description

technical field [0001] The invention belongs to the technical field of analog-to-digital converters, and in particular relates to a method for calibrating the weight of a capacitor array. Background technique [0002] At present, the most widely used analog-to-digital converter (ADC) is based on capacitor array as its main structure, and in the process of integrated circuit manufacturing, there will be matching problems between capacitors, especially for applications with limited chip area, the unit capacitance changes The matching error of the capacitor becomes smaller and smaller, and the mismatch error of the capacitor has a great influence on the performance of the ADC, so it needs to be calibrated. [0003] A self-calibration technology in the prior art uses a separate calibration capacitor array to measure the error of each bit of capacitance and store the error in a register. In actual operation, the calibration capacitor array converts the error into an analog quanti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10H03M1/46
CPCH03M1/1023H03M1/462
Inventor 金乐乐朱循宇
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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