D/A converter circuit employing multistage amplifier part multiplexing technology

Abstract

The invention discloses an analog-digital converter circuit adopting the partial multiplex technique of a multistage amplifier. The analog-digital converter consists of a flash structure and at least one combination flow stage. The flash structure is taken as the last stage of the flow stages, and the combination flow stage comprises a first flow stage and a second flow stage, wherein, the first flow stage consists of a first stage sub-amplifier A1, a second stage sub-amplifier A2, and a third stage sub-amplifier A3 in series sequentially; the second flow stage consists of a second stage sub-amplifier A2, a third stage sub-amplifier A3, and a fourth stage sub-amplifier A4 in series sequentially; and the second stage sub-amplifier A2 and the third stage sub-amplifier A3 are shared by the first flow stage and the second flow stage. By adopting the analog-digital converter circuit, the consumption of an amplifier and a system thereof is cut, and the design complexity and the dynamic performance are reduced.

Description

technical field [0001] The invention relates to the technical field of pipeline analog-to-digital converter circuits, in particular to a low-voltage, low-power consumption analog-to-digital converter circuit using a multi-stage amplifier partial multiplexing technology. Background technique [0002] In the past two decades, my country's economic growth rate was as high as 9.7%, while the energy consumption growth rate was 4.6%, which was far lower than the economic growth rate. In the next few years, the economy will still maintain a momentum of rapid growth, and energy demand will also continue to rise. With the gradual deepening of awareness of local and even global environmental problems caused by energy use, China is facing greater environmental pressure. [0003] The "National Medium and Long-Term Science and Technology Development Program Outline" promulgated on December 30, 2005 expounded the development goals of my country's high-tech industries and energy industrie...

AI Technical Summary

Problems solved by technology

In low-power pipeline analog-to-digital converters, the technology of amplifier multiplexing has been proven to greatly reduce system power consumption, but at the same time, in order to enable amplifiers to be multiplexed by multi-stage pipelines, in order to control complex and circuit structure, too many switches bring a lot of charge injection noise and clock feedthrough effect

[0018] In addition, the traditional appearance clock controls the amplification and reset (or auto-zero) of the amplifier alternately, but in the amplifier multiplexing structure, the amplifier has to undertake the amplification task of the two-stage pipeline structure, so that the reset or auto-zero cannot be performed. , greatly reducing the settling time performance of its amplifying stage

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