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Successive approximation type analog-to-digital converter for asymmetric alternate monotonous switching in two steps

A successive approximation type, analog-to-digital converter technology, applied in analog-to-digital conversion, code conversion, instruments, etc., can solve the problems of high power consumption and large area of ​​CDAC, and achieve elimination of reset energy, area reduction, and low switching. energy effect

Active Publication Date: 2020-03-24
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the high power consumption and large area of ​​CDAC existing in the prior art, and to provide a successive approximation analog-to-digital converter with two-step asymmetric alternating monotonic switching

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  • Successive approximation type analog-to-digital converter for asymmetric alternate monotonous switching in two steps
  • Successive approximation type analog-to-digital converter for asymmetric alternate monotonous switching in two steps
  • Successive approximation type analog-to-digital converter for asymmetric alternate monotonous switching in two steps

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] see figure 1 , the present invention includes a main capacitor array, a comparator and a logic control unit, and the main capacitor array includes a sampling capacitor array MSBs array, a bridge capacitor C bAnd capacitor array LSBs array, the positive input and reverse input of the comparator are connected to the sampling capacitor array MSBs array, the output of the comparator is connected to the logic control unit, and the logic control unit is connected to the capacitor array LSBs array; the output code D0~ D2, D3-D5 and D6-D9 are determined by the capacitor switching process in the capacitor array MSBs array, PLSB array and NLSB array respectively. The conversion process of the LSBs array is divided into two steps, wherein D0-D2 is determined in the capacitor array MSBs array as the first step; correspondingly, D3-D9 is determined in the LSBs array as the ...

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Abstract

The invention discloses a successive approximation type analog-to-digital converter for two-step asymmetric alternating monotonic switching. A multiplexing method is adopted, so that the connection between a capacitor array LSBs array and the capacitor array MSBs array is re-established, and fewer unit capacitors are switched in the first three decision periods. Top plate sampling and level integral conversion technologies are used; the switching energy consumed by the LSBs array in the first two comparison periods (MSB and MSB-1) is zero, and based on a multiplexing method and a two-step monotonous switching process, the low switching energy in the process from the MSB-3 period to the obtaining of the LSB can be obviously ensured. By adopting a two-step reset method, the reset energy of the next sampling stage can be eliminated, so that 98.3% of energy is saved.

Description

technical field [0001] The invention belongs to the field of analog integrated circuit design, in particular to a successive approximation analog-to-digital converter with two-step asymmetric alternate monotone switching. Background technique [0002] Successive-approximation analog-to-digital converters (SAR ADCs) have been extremely influential in wireless sensor devices and high-speed communication standards due to their inherent low power consumption. Typically, the capacitive digital-to-analog converter (CDAC) of a SAR ADC accounts for a major portion of the total power consumption compared to the comparator and digital control circuitry. Researchers have put considerable effort into solving this problem, and several energy-efficient switching schemes have been published. Taking the Vcm-based switching scheme as a reference, higher-side-reset-and-set and tri-level, VMS and hybrid reduce the switching energy by 37.6%, 75.1%, 81.3% and 90.7%. In previous work, the energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/38
CPCH03M1/38
Inventor 张国和常科刘沛董雷屈展
Owner XI AN JIAOTONG UNIV
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