Hi Dario, I was watching again the PDN videos and its part related to decoupling capacitor network and I will put here what I have understood to see if it is correct and if not please correct me (in advance I say that I will put certain assumptions in concept although I understand that in general the whole process would be more complicated and would have to look datasheets ... etc.). Steps: 1) Find the operating frequency of the circuit (Assume an ESP32 microcontroller is used = 240MHz operating frequency). Assuming that all the ICs on the PCB is the one with the highest frequency. 2) Look for a capacitor with the lowest possible ESL whose cutoff frequency (Fc=1/(2*PI*SQRT(L+C))) is able to cover the operating frequency (240Mhz) and I have also read that it is recommended to cover up to the seventh harmonic which implies that Fc must be greater than or equal to 7*240MHz = 1680 MHz. So I select a 1pF capacitor and assume ESL (inductance matching) = 15nH. Applying formula of Fc= 1.3 GHz. I give it for good because I cover more than the operating frequency and I approach the 7th harmonic. 3) I calculate the Ztarget =Vdrop(Drop voltage of the most restrictive IC of my PCB)/Imax (of my PCB which will be divided between all my ICs). Typical value of Vdrop=0.5V and I assume an Imax=2.5A. Ztarget = 0.2 Ohm

4A) Now I will calculate the number of capacitors that I need to put in parallel to meet the calculated Ztarget. Using the formula N=2*ESL/Ztarget*Tt, the strategy you indicate of putting capacitors of the same value in parallel and assuming that the ESL will be reduced by also being in parallel. Where Tt is the rise time that is calculated as 0.35/BW (BW in this case will be the 240MHz of ESP32) Tt would be approximately 1.5 nS and therefore the N would be approximately 103 capacitors and it doesn't fit me. I haven't understood something well or at some point I'm not doing it right but I don't know where. Could you finally tell me how it is and correct me? Thank you very much in advance

I consider myself a beginner in the world of electronic design so, from my humble point of view, I would like to cover all the basics to design an IoT board in a professional way explaining well the basis on which it is based. I mean for example how to choose the power supply, how to define the design rules well, how to correctly define the stack up of the PCB (what types of Stack up configurations are there and which is used for what), what peculiarities should be taken into account if our PCB has an antenna, how to protect our PCB from ESD and how to properly select the protections, general guidelines to take into account the EMC in the design (When you have mixed digital and analog circuits) ... etc... Maybe it is very basic but I would be interested in learning the basics very well and grow as I evolve.

@Dario Fresu It would be a good Idea but I think it would be better a project wich imply to select, configure and use little and comercial ARM M3 (STM32 For example). I think so because is really use in professional enviroments and I would like to learn how to integrate the microcontroller into the PCB and how to select the Cristal/Oscillator and how to route it as a proffesional from EMC point of view. As well it woud be wonferful to learn hot to choose the properly prog/debug connector...