Capacitor exchange method for improving DNL (Differential Nonlinearity)/INL (Integral Nonlinearity) of successive approximation analog to digital converter

An analog-to-digital converter and successive approximation technology, applied in analog/digital conversion, code conversion, instrumentation, etc., can solve problems such as limitations, and achieve the effect of simple structure, easy implementation, and small chip area occupation

Inactive Publication Date: 2015-11-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The "minimum mean square error" algorithm generally requires hundreds of thousands of samples to converge, which has great limitations in practical applications

Method used

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  • Capacitor exchange method for improving DNL (Differential Nonlinearity)/INL (Integral Nonlinearity) of successive approximation analog to digital converter
  • Capacitor exchange method for improving DNL (Differential Nonlinearity)/INL (Integral Nonlinearity) of successive approximation analog to digital converter
  • Capacitor exchange method for improving DNL (Differential Nonlinearity)/INL (Integral Nonlinearity) of successive approximation analog to digital converter

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Embodiment Construction

[0026] The present invention proposes a capacitance exchange method for increasing the DNL / INL of the successive approximation analog-to-digital converter, and switches the sub-high-level capacitance and all subsequent capacitances between two conversions to improve DNL and INL. The following is a detailed description of the 4-bit SARADC as an example. The sampling of the input voltage and the judgment of the highest bit are described in the literature [Hariprasath, VandGuerber, JonandLee, S-HandMoon, U-K, "MergedcapacitorswitchingbasedSARADCwithhighestswitchingenergy-efficiency", ElectronicsLetters, pp.620--621 ,2010.] to improve on the basis of the MCS-basedSARADC proposed. The traditional MCS-based SARADC uses upper plate sampling. The advantage of upper plate sampling is that the number of sampling switches is small, but it is sensitive to parasitic capacitance. The present invention uses lower plate sampling, which can improve the accuracy of SARADC and reduce its sensitiv...

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Abstract

The invention discloses a capacitor exchange method for improving the DNL (Differential Nonlinearity) / INL (Integral Nonlinearity) of a successive approximation analog to digital converter (ADC), and relates to the fields of microelectronics and solid-state electronics, in particular to the field of high-performance ADCs. The DNL / INL error caused by judgment of a secondary high order can be offset by exchange of a secondary high-order capacitor with all subsequent capacitors between two conversions without introduction of any extra ADC, introduction of any correction algorithm or splitting of any capacitor. Compared with a conventional correction method for improving the DNL / INL with dependence on an auxiliary ADC, a correction algorithm or capacitor splitting, the capacitor exchange method has the effects of simpler structure, smaller chip occupation area and higher easiness in on-chip implementation.

Description

technical field [0001] The invention relates to the field of microelectronics and solid state electronics, especially the field of high-performance analog-to-digital converters. Background technique [0002] The ADC converts the analog signal into a digital signal, which is a process of anti-aliasing filtering, sampling, holding and encoding. The analog signal passes through the anti-aliasing filter and the sample-and-hold circuit, and first becomes a ladder-shaped signal, and then passes through the encoder to convert each level in the ladder-shaped signal into a corresponding binary code. Its working principle is as follows: figure 1 As shown, among them, the anti-aliasing filter filters out the out-of-band signal in the input signal to prevent it from being mixed into the effective bandwidth, the sample-and-hold circuit samples the continuous signal to discretize the continuous signal, and the quantization circuit converts the discrete sample The signal is converted into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/38
Inventor 樊华佛朗哥·马勒博迪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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