Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
08/04/06 14:06
Read: times


 		 #121652 - Miker, it sounds as if you need to buy a book by D
Responding to: ???'s previous message
Miker, it sounds as if you need to buy a book by Dr. Howard Johnson.

I do not know much about these things, but what i know id from his articles.

Anyhow, I have had a large 4 layer board (with PLENTY of decoupling caps) consisting of 12 CPLDs running at 60MHz BEFORE I even knew that there was such a thing as trace impedance. It was supposed to run at 100 MHz, but THAT it could not do. Well, eventually it was run a 48 MHz (safety factor) and that turned out to suffice.

Erik

List of 25 messages in thread
TopicAuthorDate
Decoupling Capacitors            01/01/70 00:00      
   Paralleling...            01/01/70 00:00      
      Well have a look at the design            01/01/70 00:00      
         I will...            01/01/70 00:00      
            No layout available at the moment            01/01/70 00:00      
               May I ask why you don't follow the reference?            01/01/70 00:00      
                  Because            01/01/70 00:00      
                     No relevant difference, I think            01/01/70 00:00      
                        I do not think so            01/01/70 00:00      
                        try one poured layer for each supply            01/01/70 00:00      
                           Exactly!            01/01/70 00:00      
                              He will need multiple layers anyway            01/01/70 00:00      
                                 Fast clock signals            01/01/70 00:00      
                                 Multiple layers is no joke            01/01/70 00:00      
                                    That's a problem, all right ...            01/01/70 00:00      
                                       Same song second verse            01/01/70 00:00      
                                          Miker, it sounds as if you need to buy a book by D            01/01/70 00:00      
                                          Discontinuities and other mess            01/01/70 00:00      
                                    I wouldn't do that            01/01/70 00:00      
                     This stuff basically hasn't changed in 30 years            01/01/70 00:00      
      I never used individual ferrites ..            01/01/70 00:00      
         You WILL in mixed circuits...            01/01/70 00:00      
   never seen that, but have seen the opposite            01/01/70 00:00      
      Maybe somewhere in between will work            01/01/70 00:00      
   No longer interested, Mike??            01/01/70 00:00      

Back to Subject List