| ??? 12/04/07 20:29 Read: times |
#147868 - Resonance on supply lines Responding to: ???'s previous message |
Actually - the VCC+GND+capacitor becomes easily a tuned circuit. Usually the capacitance values are chosen high to avoid ringing on supply lines and/or set the resonance frequency as low as possible. It may also be the lazyness of engineers: "0.1 uF should be enough ...". Ihave seen 47n capacitors used for decoupling but lower values .... never.
For that same reason one should not make the decoupled loops identical but slightly different. One way is to use two values for the decoupling capacitors. Snubbers may also be used to eat up the ringing. There is also an excellent EMI article collection in this forum - where was that ? |
| Topic | Author | Date |
| 1uF or 0.1uF or 0.01uF for decoupling? | 01/01/70 00:00 | |
| Resonance on supply lines | 01/01/70 00:00 | |
| laziness? problems? | 01/01/70 00:00 | |
| Contamination | 01/01/70 00:00 | |
| Exactly | 01/01/70 00:00 | |
| In the FAQs | 01/01/70 00:00 | |
| This depends on your application | 01/01/70 00:00 | |
| Application specific | 01/01/70 00:00 | |
| Values | 01/01/70 00:00 | |
| Does this applies equally to | 01/01/70 00:00 | |
| This also depends | 01/01/70 00:00 | |
This also depends | 01/01/70 00:00 | |
| Also | 01/01/70 00:00 | |
| location, location, location | 01/01/70 00:00 |