液晶与显示2017，Vol.32Issue(8)：622-627,6.DOI:10.3788/YJYXS20173208.0622
用于触摸屏控制电路的低功耗模数转换器设计
Design of low power analog-to-digital converter for the control circuit of touch screen
摘要
Abstract
In order to reduce the power consumption of the touch screen control circuit, a low power successive approximation analog-to-digital converter (SAR ADC) was proposed. The capacitor array digital-to-analog converter (DAC), comparator and successive approximation register were studied and designed. Firstly, based on two-stage parallel-series capacitor, the capacitor array DAC and reference voltage switching scheme is designed. Next, two-stage fully dynamic comparator is designed and the principle is analyzed. Then, based on the dynamic logic, successive approximation register with low power and low error code is designed. Finally, the ADC was implemented in 180 nm CMOS technology 1 V power supply and simulated at the input frequency Fin = 96.243 kHz and sampling frequency Fs=200 kHz. The Simulation result indicates that values of Integral Non-Linearity(INL) and Differential Non-Linearity(DNL) are 0.222/-0.203 LSB and 0.231/-0.184 LSB respectively. Spurious Free Dynamic Range(SFDR) is 76.56 dB, Signal to Noise and Distortion Ratio is 61.50 dB, Effective Number of Bits(ENOB) is 9.92 bits. The power dissipation is only about 0.464 μW, figure of merit (FOM) is equal to 2.4 fJ/Conv.-step. In conclusion, the low power SAR ADC proposed in this paper meets the application requirement of touch screen control circuit.关键词
触摸屏/低功耗/逐次逼近型模数转换器Key words
touch screen/low power/successive approximation analog-to-digital converter分类
信息技术与安全科学引用本文复制引用
胡云峰,邓春健,李斌..用于触摸屏控制电路的低功耗模数转换器设计[J].液晶与显示,2017,32(8):622-627,6.基金项目
国家自然科学基金资助项目(No.61571196) （No.61571196）
广东省科技计划项目(No.00760211330304099,No.2014A010103016,No.2014B090912001) （No.00760211330304099,No.2014A010103016,No.2014B090912001）
中山市科技计划项目(No.2016B2146,No.2017B1019)Supported by National Natural Science Foundation of China(No. 61571196) （No.2016B2146,No.2017B1019）
Science and Technology Plan Project of Guangdong Province, China(No.00760211330304099,No.2014A010103016,No.2014B090912001) （No.00760211330304099,No.2014A010103016,No.2014B090912001）
Science and Technology Plan Project of Zhongshan, China (No.2016B2146,No.2017B1019) （No.2016B2146,No.2017B1019）
