An ultra-low power successive approximation analog-to-digital converter based on supply voltage

Abstract

The invention relates to an ultralow-power-consumption successive approximation analog-to-digital converter based on power supply voltage. The ultralow-power-consumption successive approximation analog-to-digital converter comprises a first sampling unit, a first control logic unit, a second sampling unit, a second control logic unit, a bootstrap switch K1, a bootstrap switch K2 and a comparator.Wherein the positive input end of the comparator is respectively connected with the first sampling unit and the bootstrap switch K1; The reverse input end of the comparator is respectively connected with the second sampling unit and the bootstrap switch K2; The output end of the comparator is connected with the first control logic unit and the second control logic unit. The first logic control unit is respectively connected with the bootstrap switch K1 and the first sampling unit; And the second logic control unit is respectively connected with the bootstrap switch K2 and the second sampling unit. According to the ultra-low power consumption successive approximation analog-to-digital converter based on the power supply voltage provided by the invention, the use of common-mode voltage is avoided, so that the circuit power consumption generated by the common-mode voltage is eliminated; And meanwhile, the power consumption of the successive approximation type analog-to-digital converter is further reduced.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an ultra-low power consumption successive approximation analog-to-digital converter based on power supply voltage. Background technique [0002] Successive approximation analog-to-digital converter (SAR ADC, successive approximation register Analog to Digital), in each conversion process, by traversing all quantized values ​​and converting them into analog values, comparing the input signal with it one by one, and finally getting the desired output digital signal. Due to the advantages of simple structure and low power consumption of successive approximation analog-to-digital converters, successive approximation analog-to-digital converters are widely used in fields with low power consumption requirements such as wearable devices and medical devices. [0003] The rapid development of digital technology in recent years has led to higher and higher requirem...

AI Technical Summary

Problems solved by technology

Traditional successive approximation analog-to-digital converters have large power consumption, and most of the research on low power consumption in recent years is based on the common mode voltage (VCM), which will add a part of the circuit to generate common mode voltage (VCM), this circuit also generates a significant portion of the power dissipation

Images