A Charge Pipeline Successive Approximation Analog-to-Digital Converter

Abstract

The invention relates to a charge type assembly line successive approximation register analog to digital converter which comprises a BCT structure. The input end of the BCT structure and the output end of the BCT structure are both connected with SAR ADC structures, and low-order digits and low power consumption are adopted in stages of the SAR ADC structures; the SAR ADC structure connected to the input end is an SAR structure with a constant common mode; the SAR ADC structure connected to the output end is a charge-sharing SAR type structure. By arranging the two stages of SAR ADC structures connected with the BCT structure, the advantages of low power consumption of the SAR ADC structures and the BCT structure and the advantages, in the aspect of speed, of an assembly line are combined, and therefore the ADC structures with the medium sampling rate and the medium conversion accuracy have the relatively obvious power consumption advantage. The two sub-stage ADC structures are low-order-digit SAR structures, a simple amplifier structure is adopted in the BCT structure, the overall area of a circuit is small, an original conventional amplifier structure is replaced by the BCT structure, and the purpose of further reducing power consumption is achieved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a charge-type pipeline successive approximation analog-to-digital converter. Background technique [0002] With the continuous development of digital signal processing technology, the digitization and integration of electronic systems is an inevitable trend. However, most of the signals in reality are continuously changing analog quantities, and the analog-to-digital converter that converts analog signals to digital signals is an indispensable part in the design of future digital systems. Conversion speed, conversion accuracy, and power consumption are important indicators for measuring the performance of analog-to-digital converters. Especially for portable electronic devices that use analog-to-digital converters, low power consumption design is particularly important. [0003] An analog-to-digital converter (ADC) with a sampling rate of tens of megahert...

AI Technical Summary

Problems solved by technology

Nevertheless, the sub-level ADC of the conventional charge-type pipeline ADC still adopts the flash structure, and it still does not have the advantage in power consumption for the ADC that realizes the sampling rate of tens of megahertz and the conversion accuracy of about ten bits.

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