Nine-stage ten-bit pipelined ADC circuit

Abstract

The invention discloses a nine-stage ten-bit pipelined ADC circuit. During the designing of a modular circuit, to avoid nonlinearity caused by on-resistance change of an ordinary CMOS switch, firstly, a nine-stage pipelined unit is adopted for the overall structure of an ADC, identical 1.5-bit structures are adopted by all the nine stages, so that modularization of the circuit is improved, and the figure adjustment technique is adopted to reduce the designing requirements of a sub-analog-digital converter (SubADC) and reduce the influence of non-ideal factors; secondly, optimal design is conducted on the modular circuit to reduce the error of the ADC. According to the nine-stage ten-bit pipelined ADC circuit, due to the fact that a single-capacitor sampling hold circuit and a bootstrapped switch are used, sampling linearity and accuracy are improved; due to the fact that an operational amplifier detuning eliminated type switched capacitor MDAC circuit structure is adopted, margin amplification accuracy is improved; a full-adder circuit is used for achieving figure adjustment, and the structure is simple.

Description

technical field [0001] The invention relates to a pipeline ADC circuit, in particular to a nine-stage ten-bit pipeline ADC circuit. Background technique [0002] Since the 1990s, the application of digital technology has become more and more extensive. There are several reasons why digital technology is superior to traditional analog technology: first, because it is insensitive to interference such as noise and power supply changes, digital processing can achieve higher precision than analog processing; second, digital signals can Convenient storage without distortion and loss of integrity; third, the digital signal processing method enables more complex processing algorithms to be realized more conveniently, and is also conducive to product upgrades and replacements; fourth, the development of computer-aided design technology It enables digital technology to realize design automation very conveniently and effectively; fifth, and more importantly, the development of large-s...

AI Technical Summary

Problems solved by technology

The main error sources in the pipeline ADC include switch nonlinearity, comparator offset, and op amp non-ideal characteristics: including finite gain error, offset, etc., capacitance mismatch error, these factors will bring MDAC gain error, and thermal noise, The influence of non-ideal factors such as clock feedthrough makes the transmission characteristics of the pipeline ADC non-ideal

Images