| ??? 12/30/05 18:10 Read: times |
#106245 - It's the neglectin of solid ground plane Responding to: ???'s previous message |
Nikhil said:
my pcb is single layer so i cannot have solid ground plane. A solid ground plane is needed! Without using a solid ground plane your circuit runs at it's limits refering to timing and noise margin headrooms. So, only the smallest additional noise is enough to make your board fail! Then, you start to look for the origin of problems at the wrong side: It's not the load switched on mains, which is responsible for the malfunction, but the neglecting of well established and proven design rules. You might find that an additional filter here or there will solve the problem, but the next interference hitting your system at another point of entry will again make your circuit fail. So, please use a solid ground plane, when working with modern digital circuits! I know, using double sided boards or even multilayers is espensive, but there's no excuse for neglecting them. Kai |
| Topic | Author | Date |
| 2 power supply problems | 01/01/70 00:00 | |
| Experts are in Christmas holidays.. | 01/01/70 00:00 | |
| low pwr chips | 01/01/70 00:00 | |
| Improved '51 | 01/01/70 00:00 | |
| Re:low pwr chips | 01/01/70 00:00 | |
| try first | 01/01/70 00:00 | |
| LP2950CZ-5.0 is good one | 01/01/70 00:00 | |
| Answers | 01/01/70 00:00 | |
| thank u kai i am already having | 01/01/70 00:00 | |
| Further questions | 01/01/70 00:00 | |
| The often overlooked fact is that "power | 01/01/70 00:00 | |
| i have used 3300uf storage cap | 01/01/70 00:00 | |
| posts in gobbelygook | 01/01/70 00:00 | |
| i was not aware | 01/01/70 00:00 | |
| why should I try to decipher what you | 01/01/70 00:00 | |
| capacitor postions | 01/01/70 00:00 | |
you need 10-100nF directly (less | 01/01/70 00:00 | |
| It's the neglectin of solid ground plane | 01/01/70 00:00 | |
| thank you kai i will try with solid gnd | 01/01/70 00:00 | |
| Directly underneath the signal traces | 01/01/70 00:00 | |
| a suggestion | 01/01/70 00:00 | |
| Simple Switchers LM2575 | 01/01/70 00:00 |