Scientific Research Publishing

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=54191#.VPAwayzQrzE Author(s) Jose-Ignacio Izpura * Affiliation(s) Department of Aerospace Systems, Air Transport and Airports, GMME-CEMDATIC Research Group, Universidad Politécnica de Madrid (UPM), Madrid, Spain . ABSTRACT The origin of the Johnson noise of resistors is reviewed by a new model fitting in the Fluctuation-Dissipation framework and compared with the velocity noise in Brownian motion. This new model handling both fluctuations as well as dissipations of electrical energy in the Complex Admittance of any resistor excels current model based on the dissipation in their conductance. From the two orthogonal currents associated ...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=54191#.VO7KvizQrzE Author(s) Jose-Ignacio Izpura *   Affiliation(s) Department of Aerospace Systems, Air Transport and Airports, GMME-CEMDATIC Research Group, Universidad Politécnica de Madrid (UPM), Madrid, Spain . ABSTRACT The origin of the Johnson noise of resistors is reviewed by a new model fitting in the Fluctuation-Dissipation framework and compared with the velocity noise in Brownian motion. This new model handling both fluctuations as well as dissipations of electrical energy in the Complex Admittance of any resistor excels current model based on the dissipation in their conductance. From the two orthogonal currents associated to a sinusoidal voltage in an electrical admittance, the new model that also considers the discreteness of the electrical charge shows a Cause-Effect dynamics for electrical noise. After a brief look at systems considered ...