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Sigma-Delta modulator and analog/digital converter

A modulator and integrator technology, applied in the field of Sigma-Delta modulators and analog-to-digital converters, can solve the problems of increasing loop delay, increasing design difficulty, increasing chip area, power consumption and cost, and achieving increased power consumption. consumption and cost effects

Active Publication Date: 2012-11-28
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the correction of the resistance in the RC integrator in the prior art is mainly done by adding new devices, which will increase the loop delay, increase the difficulty of design, and also increase additional chip area, power consumption and cost

Method used

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  • Sigma-Delta modulator and analog/digital converter

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Embodiment Construction

[0034] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] see figure 1 , which is a schematic diagram of Embodiment 1 of the Sigma-Delta modulator provided by the present invention.

[0036] An embodiment of the present invention provides a Sigma-Delta modulator, including: a quantizer 300, a correction module 400, and an RC integrator 1; wherein,

[0037] The correction module 400 includes a predetermined resistance through which a correction level is generated;

[0038] The correction module 400 is configured to use the comparator in the quantizer 300 to compare the correction level with a predetermined reference voltage, so as to generate a digital correction signal, and perform the RC integrator I according to the digital correction signal The resistors in the resistor correction a...

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Abstract

The invention provides a Sigma-Delta modulator and an analog / digital converter. The Sigma-Delta modulator comprises a quantizer, a correction module and an RC integrator, wherein the correction module comprises a preset resistor, and correction level is generated through the preset resistor; the correction module is used for comparing the correction level with the preset reference voltage by utilizing a comparator in the quantizer, so that a digital correction signal is generated, and the resistor in a resistor correction array of the RC integrator is corrected according to the digital correction signal; and the preset resistor has the same type as the resistor in the resistor correction array of the RC integrator. According to the Sigma-Delta modulator, the resistance tolerance in the RC integrator can be corrected.

Description

technical field [0001] The invention relates to the technical field of analog-to-digital converters, in particular to a Sigma-Delta modulator and an analog-to-digital converter. Background technique [0002] In recent years, Sigma-Delta analog-to-digital converters have received more and more attention because of their advantages such as high precision, high integration, and low power consumption. Sigma-Delta analog-to-digital converters are divided into two types: continuous time and discrete time, according to the implementation of the integrator. Compared with discrete-time Sigma-Delta ADCs, continuous-time Sigma-Delta ADCs have lower power consumption, faster speed, and inherent anti-aliasing advantages, which can effectively increase battery life, Reducing system complexity is very important for portable wireless devices. Therefore, continuous time Sigma-Delta analog-to-digital converters have received more and more attention in recent years. The Sigma-Delta modulato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/00H03M1/12
CPCH03M3/424H03M3/38H03M3/438H03M1/002H03M3/324H03M3/50
Inventor 赵喆陈岚吕志强
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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