电荷再分配SAR ADC低能耗电容阵列Matlab模型

Matlab Modeling of Energy Efficient Capacitor Arrays in Charge Redistribution SAR ADC

为了减小SAR ADC的功耗和面积,结合SAR ADC无源元件的匹配理论,采用理论分析推导及Matlab建模验证的方式,针对多种电荷再分配型SAR ADC,对其中电容阵列的能量损耗进行比较和讨论。在分析传统电荷再分配结构以及近期文献提出的两种低能耗结构(电容拆分结构和两步式结构)的基础上,提出一种结合双端采样和单位电容缩放的新型转换结构,与其他几种结构相比较,该新型结构在能耗和面积上都得到了显著优化,并且工艺实现也非常方便,适合低功耗片上系统的应用。

To reduce energy dissipation and area of SAR ADC,energy dissipation of capacitor arrays in different types of charge redistribution SAR ADC＇s was discussed based on theory analysis and Matlab modeling,as well as passive element matching theory.Based on analyses of conventional charge redistribution structure and two recently published low-power structures,a novel conversion approach combining dual sampling with unit scalable capacitor method was proposed.Compared with previous structures,this novel structure can obviously reduce area of SAR ADC and energy dissipation of internal D/A conversion network.It is also easy for process implementation and very suitable for low power SoC applications.