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Successive approximation type analog-to-digital conversion device

A successive approximation type, analog-to-digital conversion technology, applied in the field of communication, can solve the problems of charge injection error and clock feedthrough effect, increase ADC dynamic nonlinearity, etc., to reduce operating current, improve nonlinear characteristics, and reduce load capacitance. Effect

Inactive Publication Date: 2015-01-14
上海明波通信技术股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of structure will introduce serious charge injection errors and clock feedthrough effects, which will significantly increase the dynamic nonlinearity of the ADC

Method used

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  • Successive approximation type analog-to-digital conversion device
  • Successive approximation type analog-to-digital conversion device
  • Successive approximation type analog-to-digital conversion device

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Embodiment Construction

[0067] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0068] Such as figure 1 As shown, an embodiment of the present invention includes: a sample and hold circuit 110, whose input terminal is connected to an analog input signal for sampling the analog input signal, and the sampled voltage is output to the positive input terminal of the comparator 120;

[0069] The comparator 120, its negative terminal is connected to the output of the digital-to-analog converter 140, and it compares the sampling voltage output by the sample-and-hold circuit 110 with the comparison voltage output by the digital-to-analog converter 140, and outputs the comparison result to the shift register 130;

[0070] A shift register 130, which sequentially reads in and saves the comparison result of the comparator 120, and feeds back the saved comparison result to the digital-to-analog converter 140;

[0071] A digital-to-analog conv...

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Abstract

The invention discloses a successive approximation type analog-to-digital conversion device. The successive approximation type analog-to-digital conversion device comprises a sample-and-hold circuit, a comparator, a shift register, a digital-to-analog converter, a clock generation circuit and a reference voltage generation circuit. The minimum sampling error can be obtained by adopting the independent sample-and-hold circuit, and a most significant bit charge scaling digital-to-analog converter body, a least significant bit voltage scaling digital-to-analog converter body, an amplifier and the like of the digital-to-analog converter form a closed-loop switched capacitor amplifier. Due to the structure, the influence of charge injection and clock feed-through can be eliminated, the load capacitance of the amplifier can be reduced, and accordingly the power consumption can be reduced. In addition, a gapping switch is additionally arranged between the charge scaling digital-to-analog converter body and the amplifier for isolation, and therefore additional charging current caused by charge averaging can be eliminated.

Description

technical field [0001] The invention relates to the communication field, in particular to a successive approximation analog-to-digital conversion device with high linearity. Background technique [0002] The analog-to-digital converter (ADC) is an important module in the system configuration. Compared with pipeline level, Sigma-Delta and other types of analog-to-digital converters, successive approximation register analog-digital converters (SAR ADC) have the advantages of low power consumption and small size, especially due to the manufacturing process and Modern digital CMOS processes have good compatibility and are easy to implement at lower process costs. Therefore, SAR ADCs have gained a wide range, such as portable equipment, industrial control, and data signal collectors. [0003] The nonlinear characteristic is an important indicator of ADC, which includes integral nonlinearity (integral nonlinearity, INL) and differential nonlinearity (differential nonlinearity, DN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/38
Inventor 何舒风陈小元
Owner 上海明波通信技术股份有限公司
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