Digital-analog converter of successive approximation type

Abstract

The invention relates to a digital-analog converter of a successive approximation type, and the digital-to-analog converter includes a first input terminal, a second input terminal and a first capacitor array; a second capacitor array, a first switch, a second switch, and a comparator, wherein the first input terminal is electrically connected to the non-inverting input end of the comparator through the first switch, and the first capacitor array is electrically connected to the non-inverting input end of the comparator. The second input terminal is electrically connected to the inverting input end of the comparator through the second switch, and the second capacitor array is electrically connected to the inverting input end of the comparator. The invention solves a power consumption problem caused by the excessive area of a switch capacitor array in the conventional time sequence. In addition, the highest bit capacitance splitting and the characteristics of the asymmetric structure itself stabilize the linearity. Meanwhile, the application of a dummy capacitor enables the capacitor area and power consumption to be further reduced.

Description

technical field [0001] The invention belongs to the design field of digital-analog hybrid integrated circuits, and in particular relates to an ultra-low power consumption successive approximation digital-to-analog converter. Background technique [0002] With the promotion of wearable devices and the development of sophisticated biological instruments, the successive approximation analog-to-digital converter (SARADC) has been widely used due to its simple structure and low power consumption. With the development of technology, the energy consumption of tube-level circuits has dropped sharply. In contrast, the main power consumption of SAR ADC comes from the energy consumption in the process of sampling and switching of capacitor arrays. [0003] As for the traditional successive approximation analog-to-digital converter based on the capacitor array, the switching power consumption is very large due to the relatively large area of ​​the capacitor array. How to reduce the are...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of high switching power consumption due to the large capacitor array area of ​​the traditional successive approximation analog-to-digital converter based on capacitor arrays, the present invention provides an ultra-low power consumption successive approximation digital-to-analog converter

Images