Analog to digital converter

Abstract

The invention provides an analog to digital converter, which solves the problem of low speed and high power consumption of the conventional analog to digital converter with a production line type structure. The analog to digital converter comprises N levels of production line type structures which are connected with one another sequentially, wherein the first level and the second level adopt two-step flash structures, and the levels from 3 to N adopt the production line type structures; N is a positive integer more than 2; and an output of each level is output by a digital correction circuit and used as an output of the analog to digital converter. In the production line type structures, a subthreshold operational amplifier is adopted, so branch current and power supply voltage of a circuit can be reduced; therefore, the power consumption of the circuit is reduced and a design aim of ultralow power consumption can be fulfilled; meanwhile, the two-step flash structures are adopted, the high speed characteristic of the production line type analog to digital converter is retained under the condition of ultralow power consumption.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an analog-to-digital converter. Background technique [0002] With the rapid development and popularization of digital technology, especially information technology, in the fields of modern control, communication and detection, in order to improve the performance index of the system, digital computer technology is widely used in signal processing. Since the actual objects of the system are often some analog quantities (such as temperature, pressure, displacement, image, etc.), in order for the computer or digital instrument to recognize and process these signals, these analog signals must first be converted into digital signals. In this way, a circuit that can act as a bridge between analog signals and digital signals - an analog-to-digital converter is needed. [0003] An analog-to-digital converter is an A / D converter, or ADC (Analog-to-Digital Converter) for short...

AI Technical Summary

Problems solved by technology

[0005] The invention provides an analog-to-digital converter to solve the problems of speed and power consumption of the analog-to-digital converter with a traditional pipeline structure

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