Hi,

    I always try to route thinking where the current will return but would 
never expect that much of a difference with the points so close together and 
with the blob with that small resistance. How much current was passing to 
the rest of the circuit ??

Best Regards,
Alexandre Guimaraes



>> Would you believe in connecting three points 0.2" apart with
>> > 0.1" trace, I can get a 2dB improvement in switcher output noise by
>> > connecting them in the right order, as opposed to a triangular "blob"
>> that
>> > connects all three?
>>
>>    Can you comment a little more on this ? Sounds quite interesting....
>
>
> In this particular case, I was dealing with the output of a 300kHz 
> switcher.
> The node in queston connected the output diode, an electrolytic cap, and 
> an
> inductor, which fed the next stage.  I knew that routing it in the order 
> of
> diode-cap-inductor was best, and diode-inductor-cap would be worse, but I
> was curious what the "blob" would be.  So, I waited till the boards came
> back, and pulled the traces off one and made the blob with braid and
> solder.  I checked the noise on the output of the supply with a spectrum
> analyzer, on the same board, before and after.  2dB worse for the blob.
>
> There was a small value cap right across the electrolytic terminals,
> probably a 0.1, but I don't remember for sure.
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