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A Redundant Cyclic Averaging Method for Successive Approximation Analog-to-Digital Converters

An analog-to-digital converter and successive approximation technology, which is applied in the field of microelectronics and solid-state electronics, can solve problems such as difficult convergence and on-chip implementation, so as to avoid continuous accumulation of capacitance mismatch errors, easy implementation, and occupy chip area small effect

Active Publication Date: 2020-05-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Although the correction algorithm of inserting the pseudo-random (PN) sequence has high precision, it is not easy to converge, and it is not easy to implement on-chip

Method used

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  • A Redundant Cyclic Averaging Method for Successive Approximation Analog-to-Digital Converters
  • A Redundant Cyclic Averaging Method for Successive Approximation Analog-to-Digital Converters
  • A Redundant Cyclic Averaging Method for Successive Approximation Analog-to-Digital Converters

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Embodiment Construction

[0016] The present invention proposes a capacitance redundant cycle averaging method that can improve the linearity of the resistance-capacitance successive approximation analog-to-digital converter. After adding redundant bits, the capacitance is split into unit capacitance, and the input voltage is sampled and then converted. The same input The voltage is converted twice, and different capacitor arrays are used for the two conversions, so as to achieve the purpose of improving linearity. The 14-bit resistor-capacitor successive approximation analog-to-digital converter is taken as an example to describe in detail below. The system structure of the 14-bit resistance-capacitance type successive approximation analog-to-digital converter proposed by the present invention is as follows figure 2 As shown, it is composed of high 6-bit capacitance DAC, low 8-bit resistance DAC and comparator. The difference with the tradition is that the traditional high 6-bit capacitance DAC inclu...

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Abstract

The invention discloses a redundant cyclic averaging method for improving the SFDR of a resistance-capacitance successive approximation analog-to-digital converter, which relates to the fields of microelectronics and solid electronics, especially in the field of resistance-capacitance successive approximation analog-to-digital converters. Capacitor setting method. The research on capacitance mismatch correction technology first considers that it is easy to realize on-chip. The correction scheme based on LMS algorithm has high precision and good calibration effect. The correction technology of traditional auxiliary DAC is the easiest to implement on-chip and has the highest success rate, but it is not easy to achieve ultra-high precision. To solve the above problems, a capacitor redundant cycle averaging method that can improve the linearity of the successive approximation analog-to-digital converter is proposed. Through Capacitance splitting and redundant dynamic averaging have the effect of correcting capacitance mismatch.

Description

technical field [0001] The invention relates to the fields of microelectronics and solid electronics, in particular to a method for setting capacitance in a resistance-capacitance successive approximation analog-to-digital converter in the field. Background technique [0002] ADC is the "bridge" between analog system and digital signal processing (DSP). ADCs are generally divided into full parallel analog-to-digital converters (Flash ADC), pipelined analog-to-digital converters (Pipeline ADC), oversampling analog-to-digital converters (ΣΔADC) and successive approximation analog-to-digital converters (SAR ADC). Compared with several types of ADCs such as pipeline, oversampling, and Flash, SAR ADC has the advantages of simple structure, small area, and easy on-chip integration. However, due to the limitations of the current process conditions, the capacitor can only meet the matching accuracy of 10 bits, and it is not easy to achieve high precision. Therefore, it is essential...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/10
CPCH03M1/1009H03M1/38
Inventor 樊华李大刚胡达千岑远军苏华英
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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