Decouling capacitors..

[Narendrakumar]

I need to have decoupling capacitors in my design... How to choose the value of capacitors and the number of capacitors ..?

Narendra kumar

 

[Jepeto]

That dependent on the application type, basic decoupling -
0.1uF ceramic capacitor between every IC supply pin to ground
For noisy and high speed ICs such as microcontrollers you can add 1nF ceramic capacitor parallel to the 0.1uF

 

[cyberblak]

Hi,

A 100nF for each power pin of each IC is a commonly accepted value. For more serious applications, you can also parallel multiple capacitors based on their resonant frequency.

cyberblak

 

[renato]

Look at this article, it's from Analog Devices Tech Journal (Analog Dialog), Sept/2005

It was wrote using Op Amps in examples, but you can use the same principle to digital ICs and mainly at high speeds.



regards,