Digital-to-analogue conversion module for successive approximation register digital-to-analogue converter

Abstract

The invention relates to the simulation integrated circuit design field and provides a switching strategy for a successive approximation register digital-to-analogue converter (SAR ADC) based on charge discharge and three-level reference voltage, greatly reduces dynamic power consumption of capacitor discharge of a DAC module in the SAR ADC because of switch switching and can dramatically reduce integral SAR ADC power consumption. The technical scheme of the digital-to-analogue conversion module is that: the digital-to-analogue conversion module for SAR ADC is connected to upper polar plates of all capacitors of the anode end of DAC and upper polar plates of all capacitors of the cathode end of the DAC through a switch S1 and a switch S2; the upper polar plates of the capacitors of the DAC anode end are connected to an input terminal of a comparator and are connected to a switch S3 at the same time; and the output terminal of the comparator is connected to input of a logical module; and output of the logical module controls switching-on and switching-off of a DAC switch. The digital-to-analogue conversion module is mainly used in a simulation integrated circuit design manufacture occasion.

Description

technical field [0001] The invention relates to the field of analog integrated circuit design, in particular to a digital-to-analog conversion module for successive approximation analog-to-digital converters using charge discharge. Background technique [0002] The Successive Approximation Register Analog-to-Digital Converter (SAR ADC) has the characteristics of high speed and low power consumption, and is widely used in portable electronic products and implanted electronic products. With the development of these electronic products, higher requirements are put forward for the standby time, so it is necessary to reduce the power consumption of the SARADC used therein. The structure diagram of traditional SAR ADC is as follows figure 1 , consists of a digital-to-analog converter (Digital-to-Analog Converter, DAC), a comparator and a logic module. DAC generally adopts a pure capacitive structure of charge redistribution to avoid static power consumption, but the switching du...

AI Technical Summary

Problems solved by technology

DAC generally adopts a pure capacitive structure of charge redistribution, which avoids static power consumption, but the switching during the charge distribution process brings dynamic power consumption of capacitor charging and discharging.

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