A second order active bandpass filter by cascading two staggered tuned first order bandpass filters is shown, built and tested.
Intercept Bluetooth communication of smart gadgets (for example fitness devices) is a nice idea to have cheap BT sensor nodes. I will explain how to sniff and decode your Bluetooth Low Energy Data from your sensors.
Integrate circuits technology allows creating many types of devices on the silicon die. The most common devices are transistors, diodes, resistors or capacitors. Now, the different kinds of capacitors that could be integrated on-chip are discussed.
A LabView sketch was used to simulate the stochastic signals and evaluate the functionality of the autocorrelation function and the spectral power density.
It is very common with the students, which are trying to learn a new programming language, to only read and understand the codes on the books or online. But until you don’t put hands on and start typing your own small programs, compile them, find errors, simulate, etc you will not get the experience to write your own codes and therefore to learn how to program a new language.
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 
The eHealth sensor board is a nice development platform to explore the biomedical sensors, but it have many drawbacks in terms of low reliability of the sensors. Depending on the application this sensor board can be adequate or not. Continue reading “How to connect the eHealth via Bluetooth with Python to a Computer”
The thermometer code (also named as unary code) is useful to extract a vector number and use it to drive several switches. The thermometer code converts a n-bit number into a series of ones followed by zeroes of size 2^n. In this example a 8-bit vector is going to be transformed into 256 signals to drive 256 switches. The binary-to-thermometer decoder is used, instead of the binary-code, to perform smoother transition during most significant bit changing. Continue reading “Binary to Thermometer decoder in VHDL and implemented in Cadence”
In this article I am going to show how to generate a sinus wave in a FPGA with Verilog and VHDL. I am going to program and demonstrate the functionality with Vivado 2017.4. This is going to be divided into 3 parts:
- Fixed frequency sinus-signal
- Variable frequency sinus signal
The Power-On Reset I an electronic circuit that generates a reset impulse, which sets the entire design to an initial and well-known state after the power supply is detected. It often used with a RC circuit in VLSI in chip-design. In Vivado the Xilinx’s Processor System Reset LogiCORE IP provides this functionality.
Continue reading “Power-On Reset implementation for FPGA in Verilog and VHDL”