Fully digital Sigma-Delta modulator based on phase inverter

Abstract

The present invention discloses a fully digital Sigma-Delta modulator based on a phase inverter. The fully digital Sigma-Delta modulator comprises two integrators based on digital phase inverters which stabilize a working point under the effect of the auto-zero technology to realize feedback function in the integral process, a comparator based on a phase inverter which stabilizes a working point under the effect of the auto-zero technology to realize a high precision low power consumption voltage comparison function, and a feedback control logic formed by D latches and a gate circuit. The fully digital Sigma-Delta modulator can work normally under extremely low power supply voltage, the current utilization efficiency is high, and the power consumption is extremely low. A traditional amplifier is not used, however a digital module is used to carry out analog circuit design, the problems of small dynamic range, insufficient intrinsic gain, noise degradation and the like in the voltage design can be avoided, and the fully digital Sigma-Delta modulator is in accordance with the fully digital design trend of an analog-digital converter.

Description

technical field [0001] The invention relates to the technical field of analog integrated circuits, in particular to an all-digital module Sigma-Delta modulator realized based on an inverter. Background technique [0002] Since the new century, deep submicron mixed-signal integrated circuit technology has developed rapidly, and has been widely used in portable electronic devices such as MP3, digital cameras, car navigators, and smart phones. And users have higher and higher requirements for these electronic products: there must be a fast-response high-performance gaming experience, high-resolution display, fast web browsing like a computer desktop, and a convenient and easy-to-use user interface. Lower power consumption to increase battery life, and integrate more diverse functions on the same device. The trend in the mobile device market is larger screens and higher resolution displays, while the requirements for chip products are higher technology levels, better design sol...

AI Technical Summary

Problems solved by technology

[0007] 1. Under the deep submicron technology, the gain of traditional OTA becomes smaller, the noise performance becomes worse, the signal dynamic range decreases, the power consumption increases, it is difficult to adapt to low-voltage design, and the current utilization efficiency is low;

[0008] 2. Traditional comparators have slow response speed, high power consumption and poor accuracy under deep submicron low voltage

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