An all-digital block sigma‑delta modulator based on an inverter

Abstract

The invention discloses an all-digital module Sigma-Delta modulator realized based on an inverter, which includes two integrators based on a digital inverter, and the inverter stabilizes the working point under the action of the self-zeroing technology so as to be integrated The feedback function is realized in the process; a comparator based on the inverter, the inverter stabilizes the operating point under the action of the self-zeroing technology to realize the voltage comparison function with high precision and low power consumption; the comparator composed of D latch and gate circuit Feedback control logic. The invention can work normally under extremely low power supply voltage, has high current utilization efficiency and extremely low power consumption. And instead of using traditional amplifiers, digital modules are used for analog circuit design, which can avoid problems such as reduced dynamic range, insufficient intrinsic gain, and noise deterioration in low-voltage design, which is in line with the design trend of full-digital analog-to-digital converters .

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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