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23
votes
5answers
1k views

What's the use of a decoupling capacitor near a reservoir capacitor?

I've seen some circuits where a decoupling capacitor is used as well as a reservoir capacitor, like this (C4 and C5): I've read about decoupling capacitors and for me it looks as if they are meant ...
9
votes
4answers
736 views

Will a 0402 0.01uF cer cap next to a 0402 0.1uF cer cap have any power decoupling benefits?

I always understood that the point of using smaller caps in parallel was to provide low impedance at higher frequencies than the bigger caps, BECAUSE the higher capacitance caps 'usually' had larger ...
6
votes
1answer
775 views

PCB 'Emi proof' design

Currently I'm designing a GPS basestation which will have a radiomodem (broadcasting at 407-480MHz), a ARM7 microcontroller running at 60MHz and a FTDI USB chip. The FTDI USB chip even runs at 480MHz ...