This paper presents a single channel, low power 6-bit 410-MS/s asynchronous successive approximation register analog-to-digital converter （SAR ADC） for ultrawide bandwidth （UWB） communication, prototyped in a SMIC...This paper presents a single channel, low power 6-bit 410-MS/s asynchronous successive approximation register analog-to-digital converter （SAR ADC） for ultrawide bandwidth （UWB） communication, prototyped in a SMIC 65-nm process. Based on the 3 bits/stage structure, resistive DAC, and the modified asynchronous successive approximation register control logic, the proposed ADC attains a peak spurious-free dynamic range （SFDR） of 41.95 dB, and a signal-to-noise and distortion ratio （SNDR） of 28.52 dB for 370 MS/s. At the sampling rate of 410 MS/s, this design still performs well with a 40.71-dB SFDR and 30.02-dB SNDR. A four-input dynamic comparator is designed so as to decrease the power consumption. The measurement results indicate that this SAR ADC consumes 2.03 mW, corresponding to a figure of merit of 189.17 fJ/step at 410 MS/s.展开更多
与室外定位技术相比(如GPS),基于无线局域网(Wireless Area Network)的定位更适用于室内环境。两种基于接收信号强度(RSSI,Received Signal Strength Indication)的定位方法即位置指纹法和信号传播模型法广泛用于室内定位的研究。使用...与室外定位技术相比(如GPS),基于无线局域网(Wireless Area Network)的定位更适用于室内环境。两种基于接收信号强度(RSSI,Received Signal Strength Indication)的定位方法即位置指纹法和信号传播模型法广泛用于室内定位的研究。使用边界盒算法和改进的二分范围搜索算法将两种室内定位方法相结合,提出了一种改进的基于RSSI的定位方法。提出的方法根据指纹数据库中样本的横纵坐标对其进行预处理,同时使用改进的线性二分范围搜索算法降低指纹数据库中的样本数,进而提高实时定位过程的效率。最大化位置指纹维度,并添加时间维,同时通过实验数据阐明所提出的方法可提高用户位置估算的精确度。展开更多
基金Project supported by the National Science Foundation for Young Scientists of China(No.61306029)the National High Technology Research and Development Program of China(No.2013AA014103)
文摘This paper presents a single channel, low power 6-bit 410-MS/s asynchronous successive approximation register analog-to-digital converter （SAR ADC） for ultrawide bandwidth （UWB） communication, prototyped in a SMIC 65-nm process. Based on the 3 bits/stage structure, resistive DAC, and the modified asynchronous successive approximation register control logic, the proposed ADC attains a peak spurious-free dynamic range （SFDR） of 41.95 dB, and a signal-to-noise and distortion ratio （SNDR） of 28.52 dB for 370 MS/s. At the sampling rate of 410 MS/s, this design still performs well with a 40.71-dB SFDR and 30.02-dB SNDR. A four-input dynamic comparator is designed so as to decrease the power consumption. The measurement results indicate that this SAR ADC consumes 2.03 mW, corresponding to a figure of merit of 189.17 fJ/step at 410 MS/s.
文摘与室外定位技术相比(如GPS),基于无线局域网(Wireless Area Network)的定位更适用于室内环境。两种基于接收信号强度(RSSI,Received Signal Strength Indication)的定位方法即位置指纹法和信号传播模型法广泛用于室内定位的研究。使用边界盒算法和改进的二分范围搜索算法将两种室内定位方法相结合,提出了一种改进的基于RSSI的定位方法。提出的方法根据指纹数据库中样本的横纵坐标对其进行预处理,同时使用改进的线性二分范围搜索算法降低指纹数据库中的样本数,进而提高实时定位过程的效率。最大化位置指纹维度,并添加时间维,同时通过实验数据阐明所提出的方法可提高用户位置估算的精确度。
