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《Progress in Geophysics》 2012-06
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Research on low noise preamplifier of transient electromagnetic instrument

HU Zi-jun1,SONG Gang2,CHEN Xing-peng1,XI Zhen-zhu1,HUANG Long2,ZHOU Sheng2 (1.School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;2.Changsha 5D Geo-survey & Technical CO.LTD.Changsha 410205,China)  
ransient electromagnetic method is widely used in many fields such as mineral exploration,groundwater exploration and engineering survey.In order to increase the transient electromagnetic exploration depth,making full use of the advanced way data,we design a low noise and differential preamplifier circuit,and also analyze its noise,based on the principles of low noise amplifier circuit designing,and the characteristics of TEM signal of wide frequency band,dynamic range,and huge differences between late and early signals in amplitude and decay rate.Two low noise amplifiers LT1028 are used in this design to reduce the circuit noise.The simulation results and the theoretical calculation results of the noise are completely consistent.And the circuit noise spectrum chart we get by measuring indicates that the circuit we designed has a low noise level,which can satisfy the needs of transient signal preamplifier.
【Fund】: 危机矿山接替资源大比例尺定位预测基础研究(2007CB416608)资助
【CateGory Index】: TN722.71
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