C-R型多通道10 bit SAR-ADC设计

A design of 10 bit C-R multi-channel SAR-ADC

采用0.13μm工艺,设计并实现了一款单端CR型分级的10 bit SAR-ADC。在设计中,CR型分级的采用显著降低了芯片面积,高5位的温度计码控制有效消除时钟溃通等误差,自举开关的设计提高了采样精度,前置放大器的高精度静态比较器有效降低失调、提升了转换精度。设计的ADC内核尺寸为580μm×290μm,后仿真结果显示,在采样率1 MS/s下,输入正弦信号200 kHz时,ENOB可达9.5位,EO=1 LSB。

This paper presents a design and implementation of a multi 10-bit successive approximation register anglog-to-digital converter(ADC)with a 0.13μm technology.A C-R DAC optimization technique is utilized in proposed design to reduce the area of ADC.Using thermometer codes to reduces harmonic distortions due to clock feedthrough.Using bootstrapped switch to improve sampling accuracy.The comparator is designed using static architecture with preamplifiers to eliminate offset.The chip is 580μm×290μm.The post simulation show that with an sampling ratio of 1 MS/s,200 kHz signal,the ENOB is 9.5 bit and EO=1 LSB.