Wow, haven't seen that one.  Sounds like it would be pretty nasty  
though.

Other than that, I've heard a few stories online of troubles caused  
by excessive bypassing causing oscillations, etc, and I'm sure it's  
possible, but in my relatively short time I haven't run into it.

-n.


On Jan 30, 2007, at 12:42 PM, David VanHorn wrote:

>>
>>
>> Now I'm in a grad program with artists and engineers working together
>> and I'm sure everyone is sick of hearing me preach about bypass caps.
>
>
> Did you ever run into this "bypass solution"?
>
> VCC------------------------------------------------------------------- 
> ---
>         Chip       Chip           Chip         Chip
> GND------------------------------------------------------------------- 
> ---
>         cap        cap             cap           cap
> VCC------------------------------------------------------------------- 
> ---
>         Chip       Chip            Chip        Chip
>
> (and so on.)
>
> The caps are connected between the rails, but they are connecting  
> VCC on one
> row of chips to ground on the OTHER row.   I've not actually had a  
> board
> like this in my hands to measure recently, but I suspect this might  
> be worse
> than NO bypasses.
>
> I remember seeing a lot of boards laid out this way back in the  
> 70's and
> 80's though.
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