[SI-LIST] Bypass Capacitor Selection
- From: "SI List" <si-list@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 30 Dec 2003 14:21:27 +0100
Dear All,
After studying many books, the bottom line for high frequency bypass
capacitor selection seems to be the following:
Use the smallest possible package and then take the largest valued
capacitor available in that package.
Although 0201 capacitors are available, they are kind of hard to
assemble. So in our design, we are thinking of using 0402 X5R parts.
In a 0402 package, the largest value available seems to be 1 uF.
My frequency range of interest is DC to 500 MHz. In addition to the
bypass capacitors, I know that there must be a pair of closely spaced
VCC/GND reference planes.
My questions:
1. Does it make sense to only use 1 uF 0402 capacitors for bypassing?
Other people often use a combination of 1 nF/10nF/100nF. 2. I have been
looking at the frequency characteristic of 100 nF 0402 X5R capacitors
given in the data sheets of different manufacturers. The impedance vs.
frequency plot often looks quite different from manufacturer to
manufacturer. Should I choose the manufacturer with the best frequency
characteristic or are all such parts almost equivalent? 3. Does it make
sense to use surface mount capacitor arrays for bypassing?
Thanks for all your expert feedback.
Best regards,
Martin Heimlicher, heimlicher__at__enclustra//dot//com
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
