Why do we use two caps in parallel?

[coshkun]

I often see in micrcontroller applications two parallel capacitors are used for filtering purpose (100 n and 1 n). Do they function as filters for high frequency and low frequencies? In other words why do we use two caps in parallel?

 

[IanP]

Re: paralel caps

Answers to your questions are here:

http://www.interfacebus.com/Compound_Capacitor_By-Passing.html

Regards,
IanP

 

[waxtomato]

paralel caps

you guess is right!