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Signal amplitude section divided charge redistribution successive approximation A/D converter

A technology of charge redistribution and successive approximation, applied in the direction of analog-to-digital converter, analog-to-digital conversion, code conversion, etc., can solve the problem of low resolution and achieve the effect of good conversion accuracy

Inactive Publication Date: 2006-12-27
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] It can be seen from formula (1-1) that the resolution of the existing charge redistribution successive approximation A / D converter is not high and has great limitations

Method used

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  • Signal amplitude section divided charge redistribution successive approximation A/D converter
  • Signal amplitude section divided charge redistribution successive approximation A/D converter
  • Signal amplitude section divided charge redistribution successive approximation A/D converter

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Embodiment Construction

[0025] Under the condition of a given CMOS process error, the uncertainty of the capacitance ratio limits the resolution of the charge redistribution successively approaching the A / D converter. In order to reduce this effect, the charge redistribution successively approximates the resolution of the A / D converter Based on the error model, and from the study of its analysis results, a circuit structure that can improve the resolution by at least one bit is invented. Introduce the idea of ​​invention in detail below.

[0026] Please refer to: "J.L.Mccreary, P.R.Gray, "All-MOS ChargeRedistribution Analog-to-digital Conversion Techniques-Part I", IEEE J.Solid-State Circuits, Dec.1975, SC-10(6):60-68 .” Starting from the basic principle of charge redistribution successive approximation A / D converter,figure 1 The ideal potential at point x in the middle is V x = - V in + ...

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Abstract

The related successive approximating ADC comprises: a capacitor array with a T-shaped contact switch S1 on input end connected to input voltage end and reference voltage end and half reference voltage end respectively, an operational amplifier, a successive approximation logic module, and a switch. This invention can obtain better conversion precision with almost same structure.

Description

technical field [0001] The invention "charge redistribution successive approximation A / D converter divided by signal amplitude interval" relates to the technical field of electronic devices. technical background [0002] A / D (Analog-to-Digital) converter is an essential interface between analog signal and digital signal in all electronic systems, and its conversion accuracy directly affects the overall performance index of the entire electronic system. There are many types of A / D converters, but they can be mainly classified into three categories: low-resolution high-speed type (such as: Flash, Folding, Pipelined, etc.), high-resolution low-speed type (such as: Sigma-delta, Dual-integrating, etc.) and Medium resolution medium speed type (eg: Successive Approximation). The successive approximation (Successive Approximation) A / D converter based on charge redistribution (Charge Redistribution) on the capacitor array is an ideal solution for the compromise between resolution an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/38H03M1/12
Inventor 杨海钢蔺增金钟伦贵
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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