AVR-Chat

Hi Zack,
 
Just a quick one. 2 layer boards are the same as double sided.!  :o)
 
I am working on a design that is 6 layer just now. My first beyond 4 and
have to learn high speed design. It is Cortex A8 based.
 
I found a really interesting article from Bluechip Technology on this very
subject but it is related to use with Altium Designer (which luckily I have)
 
It is interesting to see how much more thought has to go into PCB design
once you start dealing with high frequency and strict timing on processor
bus lines etc. Have only ever worked with microcontrollers such as AVR and
PIC etc, this is quite a challenge but one I am enjoying the learning
exercise as a hobby. As I progress and get it all working I can take this
over to my workplace.
 
 
Dave...
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Very funny Scotty, now beam down my clothes!!!
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From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
Of Zack Widup
Sent: 27 May 2011 11:37
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] Cheap 2 layer prototype PCB boards - custom made
 
  
I have never made two-layer boards but I have made many double-sided
boards myself. I'm not set up to mass-produce boards but I can usually
make 3 or 4 at a time with no problem.

I made some boards for 47 and 78 GHz (millimeter-wave) ham radio
projects. The tiny circuits are etched on 5-mil thick Duroid
teflon-fiberglass board. I used some HSCH9251 "flip-chip" diodes.
These have packages about 10 mils square, and with leads the devices
are about 28 mils long. The leads are a few mils wide. They look like
fly specks. You can't solder them; there are two common ways of
mounting them - wirebonding and with conductive silver-epoxy such as
Epotek H20e. I use the silver epoxy.

Zack




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