[sdiy] Why dual grounds?

Paul synthesizerdiy at gmail.com
Wed Jun 9 07:44:49 CEST 2010

Can you explain/talk a bit more on clean and dirty grounds?

On Jun 9, 2010, at 12:38 AM, JH. wrote:

>> No other module has two separate grounds.
> My PCBs often also have separate GND paths, even if they are not  
> clearly marked as such.
> In a sensitive analogue circuit, you *must* separate "Dirty GND"  
> and "Clean GND" to some degree, in order to keep your signals -  
> which are voltages *between*(!) signal trace and GND trace - clean.  
> This doesn't necessarily mean star-grounding at the PSU (which I  
> suppose is what Steiner did), but it really means to keep clean and  
> dirty apart.
> Having completely separate GNDs a bit like right hand for food,  
> left hand for you know what. A good approach.
> Not completely separate GNDs means more care must be taken on  
> cleaning, i.e. decoupling to the right points, etc. :)
> JH.
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