介绍了一款低频低功耗无源射频识别(RFID)技术芯片模拟前端的设计。详细介绍了低频RFID模拟前端的整体结构和主要模块。通过对低功耗带隙基准的设计,产生合适的偏置电压,为其他模块提供偏置,以此来限制其他模块的功耗,达到降低整个模拟前端功耗的目的。通过对高性能解调电路的设计,提高解调精度,保证通信过程准确。芯片采用0.35μm标准CMOS工艺设计和制作,实际测试结果显示,在要求的最远通信距离时,芯片
The speed-of-sound variance will decrease the imaging quality of photoacoustic tomography in acoustically inhomogeneous tissue. In this study, ultrasound computed tomography is combined with photoacou
The alignment coupling between optical waveguide chips and optical fiber arrays is the basis of the alignment coupling of planar optical waveguide devices, and the precise position detection with angl
Negative effect of precipitation on plant photosynthesis was investigated in this work. Stomatal conductance, transpiration rate and net photosynthetic rate were measured before and after each precipi
An algorithm for detecting low-frequency seismic events is developed and applied to the detection of low-frequency events before the 2008 Wenchuan and the 2013 Lushan earthquakes. Continuous vertical-
In many parts of the global plates,including subduction zones,mid-ocean ridges and even the interior of the continental plates,seismic anisotropy has a certain correlation with image of absolute plate
Based on the repeated gravity observation data from 1996 to 2007 from the Longmenshan gravity network,which has been dealt with by adjustment processing,the benchmark interference removal and impact o
We collected waveforms of a teleseismic event which occurred from January 2007 to October 2011 from 174 broadband seismic stations deployed in Hebei and its adjacent areas. Using the H-k stacking meth
In order to analyze the seismic brightness temperature anomalies associated with the Yutian earthquake which occurred at Yutian County, Xinjiang on February 12,2014, daily brightness temperature data
The basic parameters,seismogenic structure and seismic sequences characteristics of the Yutian MS7. 3 earthquake on February 12,2014 are introduced and compared to the Yutian MS7. 3 earthquake in 2008