controlpaths.com

Digital control loops. Theoretical approach.

In this blog, I have tried to show you different tools, usually in the field of digital signal processing, so you can select the correct tools for your projects. This time we will use the tools that we have used in other posts but for a different purpose, we are going to design a digital control ...

Published by P.Trujillo on Feb 28, 2022

Running Petalinux on a Microblaze soft core.

You can do everything with an FPGA. I have used this sentence many times in my job, and most of them followed by, its all a time matter. Also, in this blog I have said many times that FPGA are very adaptable devices, and they fit in many projects. In addition, in the projects where microprocessor...

Published by P.Trujillo on Feb 14, 2022

Downsampling using MATLAB and the Microchip's Icicle kit.

Many times we need to manage low-frequency signals sampled at high rates. This can be due to the need to detect edges in that signal as fast as possible, for example, if we are using that signal to protect a device. This kind of situation makes the filters used to obtain a clean low band have to ...

Published by P.Trujillo on Feb 14, 2022

Designing a FM receiver with the USRP B205mini #WorldRadioDay22.

While we are driving on the way to our jobs, we have the 99.9% of our attention on the road, but I am sure that the other 0.1% of our attention is focused on the radio. Radio has been with us for most than 100 years, and today is its day, and today is the World Radio Day. For this day I wanted to...

Published by P.Trujillo on Feb 13, 2022

Ripple suppression circuit for PWM DAC.

If we are working with analog signals, is very common that we will need an analog level for set an offset if we are working with a bipolar signal, or maybe we will need an analog level to set a threshold. In these cases, the theory says that we will need a digital to analog converter, or DAC. DAC...

Published by P.Trujillo on Jan 31, 2022

Building a SoC with Litex.

There are many cases where we will need a processor inside our FPGA. In my case, soft cores are very useful when I have to implement in the FPGA a manager for an external device using high level interfaces like ethernet or modbus. For this interfaces we can find in the internet examples written i...

Published by P.Trujillo on Jan 17, 2022

Why FPGA?

This will be the first post of 2022, and I want it to be different. Time ago I have been thinking to write about how I started to use FPGA and also what I expect of them for the future. Likely, the thoughts that I am going to write in this post will change in the next year, but it would be intere...

Published by P.Trujillo on Jan 3, 2022

Application notes

[AN001] Designing from zero an IIR filter in Verilog using biquad structure and bilinear discretization.

Filtering is likely the most common DSP algorithm that any embedded engineer has to design, no matter it they are developing for an STM32, or TI DSP or, of course, en FPGA. Filtering is such important because the majority of the applications are connected to the real world, so they need to captur...