Re: [SI-LIST] : deCoupling caps and there placement

From: Chris Padilla ([email protected])
Date: Fri Nov 10 2000 - 17:06:36 PST

• Next message: Zabinski, Patrick J.: "RE: [SI-LIST] : Question about Thin Flexible Coaxial cable"
• Previous message: Michael Nudelman: "Re: [SI-LIST] : Question about Thin Flexible Coaxial cable"
• In reply to: Kowal, Keith: "[SI-LIST] : deCoupling caps and there placement"
• Next in thread: Doug Brooks: "Re: [SI-LIST] : deCoupling caps and there placement"

Inductance is the main limiter of a capacitor's bandwidth. Longer traces
have more inductance than shorter ones. Also, keep the ground and power
vias of the cap close together to reduce the loop inductance. Finally, put
the cap, in the configuration I've described, as close as possible to the
chip you are intending to decouple.

----->Chris

>I just heard a school of thought that says place decoupling caps
>physically as close as possible to GND pins....I have always keep the
>lead length as short as possible to the VCC pin which decouples the
>power pins. I understand that one should keep the ground lead as short
>as possible also ... so if one has a trade off to make , which lead
>should be longer and why...??? any thoughts
>
>keith
>DIGITAL NETWORKS

**** To unsubscribe from si-list or si-list-digest: send e-mail to
[email protected]. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****

• Next message: Zabinski, Patrick J.: "RE: [SI-LIST] : Question about Thin Flexible Coaxial cable"
• Previous message: Michael Nudelman: "Re: [SI-LIST] : Question about Thin Flexible Coaxial cable"
• In reply to: Kowal, Keith: "[SI-LIST] : deCoupling caps and there placement"
• Next in thread: Doug Brooks: "Re: [SI-LIST] : deCoupling caps and there placement"

This archive was generated by hypermail 2b29 : Tue May 08 2001 - 14:30:04 PDT