摘要
提出一种逐次逼近型模数转换器(successive approximation register analog-to-digital converter,SAR ADC)高能效电荷均值开关方法。该方法能够提供恒定的共模电压V_(CM),大小为V_(REF)的一半,且只需要使用两个参考电压VREF和地,避免了额外的电压基准电路。为了增加一位精度并保持恒定的共模电压,C-2C结构替代参考电容C。与单调开关方法相比,该方法能耗减少66.65%,电容面积减少49.41%。行为仿真结果证明了该方法的有效性。
An energy-efficient charge-average capacitor switching scheme was proposed for successive approximation register analog-to-digital converters （SAR ADCs ）. The charge-average technique ensures constant common-mode voltage VcM, which is VaE~/2. Thus, only two reference voltages, VREv and ground, are utilized, avoiding extra circuit for generating references. Besides, to add one more bit precision and to keep common-mode voltage constant, a dummy capacitor is real- ized by C-2C structure instead of unit capacitor C. As a result, the proposed switching technique can save energy by 66.65% and reduce capacitor area by 49.41%, respectively, compared to the monotonic switching scheme. Behavioural simulation results indicate that the proposed switching scheme is effective.
出处
《福建工程学院学报》
CAS
2017年第3期285-288,共4页
Journal of Fujian University of Technology
基金
福建工程学院科研启动基金(GY-Z160057
GY-Z11002)
福建省教育厅资助项目(JAT160314
JA06031)
关键词
高能效
电荷均值
开关方法
SARADC
high energy-efficiency
charge-average
switching scheme
successive approximation register analog-to-digital converters （SAR ADC）
