Ultra-low-power-consumption asynchronous successive approximation register type analog-to-digital converter

Abstract

The invention belongs to the technical field of low-power-consumption integrated circuits, in particular to an ultra-low-power-consumption asynchronous successive approximation register type analog-to-digital converter. The analog-to-digital converter comprises two bootstrap sampling and holding switches S / H, four connection switches, two binary weighted capacitor DAC networks, a sub-threshold dynamic comparator and an asynchronous SAR control logic circuit, wherein the bootstrap sampling and holding switches S / H are used for sampling an analog differential input signal to upper pole plates ofthe two binary weighted capacitor DAC networks; and the four connection switches are controlled by the asynchronous SAR control logic circuit to determine a connection relationship between the upperpole plates of highest location capacitors of the binary weighted capacitor DAC networks, i.e. whether the upper pole plates of the highest location capacitors are connected with upper pole plates ofother non-highest location capacitors or connected with the ground.

Description

technical field [0001] The invention belongs to the technical field of low-power integrated circuits, and in particular relates to a 10-bit ultra-low power asynchronous successive approximation register (SAR) analog-to-digital converter (ADC) applied to a wireless sensor network chip. Background technique [0002] As CMOS process geometries shrink, it becomes increasingly difficult to improve the performance of analog circuits operating at ultra-low power and ultra-low power consumption. Successive approximation register (SAR) analog-to-digital converters (ADCs) have recently become one of the most popular converters in ultra-low power Wireless sensor network chips or portable biomedical devices. In these energy-constrained applications, systems and circuits can often be powered by energy-constrained batteries or small-sized energy harvesting devices, which result in limited lifetimes. Therefore, it is essential to design energy-efficient system structures and circuits in ...

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Problems solved by technology

[0007] The object of the present invention is to provide a 10-bit ultra-low power consumption asynchronous successive approximation register type analog-to-digital converter applied to wireless sensor network chips, aiming at solving the problem of high power consumption of the existing successive approximation register type analog-to-digital converters Large, low linearity and accuracy issues

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