A LabView sketch was used to simulate the stochastic signals and evaluate the functionality of the autocorrelation function and the spectral power density.
The scanning tunnelling microscopes have become the eyes of the scientists, a necessary and essential tool in the laboratories of education and research for the characterization of nanoscale. This article presents the basics of a tunneling microscope that have allowed scientists the visualization and modification of nanoscale surfaces. A methodology for the correct visualization and characterization of surfaces is described using the implemented instrument, reaching the bidimensional quantification of characteristics. This methodology, determined experimentally, takes into account critical parameters for stabilization of the tunnel current, such as the scanning speed and the geometries and dimensions of the microscope needles.
Figure 1: Relief of two complete 7 x 7 unit cells in 1982 
Also called ΔΣ-converter or ΣΔ-converter, this is one of the most used method to get high resolution analog to digital converters (ADC) at a certain speed. Nowadays is often included in the microcontrollers displacing the typical SAR standard converter. [Read more…] about Delta-sigma (ΔΣ) and SAR as standar ADC converter in microcontrollers
I recently noticed that my diplom thesis is available online on the university repository.