Division algorithms in FPGA.

Digital signal processing involves many different operations. Although there are some algorithms with a high level of digitalization, they can be computed only with additions and shifts, others require specific hardware. For example, we need multiplicators to use an IIR filter, since the input an...

Published by P.Trujillo on Jun 20, 2022

How to use a digital oscilloscope.

When we is studying a degree related with electricity (electronics, electronics, electrical, communications, …), one of the elements which is very familiar to us is the oscilloscope. I remember when I started my electronics course (here in Spain we call it professional degree), we used analog o...

Published by P.Trujillo on Jun 20, 2022

Frequency warping using the bilinear transform.

The process to design a IIR filter is always the same. First of all we have to design the design the filter using its continuous transfer function, then, once the natural frequency of the filter, the order and the quality factor are selected, we will obtain the corresponding s function. The next ...

Published by P.Trujillo on May 9, 2022

Exploring the Cordic algorithm.

Many years ago, the processors were slow, and they only can compute additions and, spending some time, multiplications. Calculating division was a hard task, and no mention trigonometric operations and square roots. As low resources makes the people smarter, in 1959, Jack Voelder created an algor...

Published by P.Trujillo on Apr 25, 2022

FilterBuilder v0.1

As I said in other posts, I am FPGA designer in a company. My functions are, between others, implement the signal acquisition and apply different digital signal processing algorithms, to obtain a signal that the FPGA can use to control the power electronic device. My regular workflow when I have ...

Published by P.Trujillo on Apr 11, 2022

Running Linux on a Litex SoC.

That FPGA are very versatile devices is something that everybody knows, and the fact that you can implement inside many different processors makes the FPGA very interesting devices for test different processors architectures. In this blog we already saw the benefits of Litex, and how you can impl...

Published by P.Trujillo on Mar 28, 2022

Proportional – Integral regulator. Implementation and verification.

In the last post we talked about digital control loops. In short, we talked about the elements that we can find in digital, or analog, control loops. The first of them is an element to acquire the difference between the actual output of the system, and the desired output, in other words, the erro...

Published by P.Trujillo on Mar 14, 2022