[EEG] Biosemi's take on the common reference electrode

Jonathan Foote jtfoote at ieee.org
Thu Jan 7 13:16:33 PST 2010


Wow, that explains a lot.

The diagram is great:  http://www.biosemi.com/pics/zero_ref1_big.gif
So the DRL isn't passive, it actively cancels out the common-mode
noise by driving the body to what should be the reference (zero)
level. Neat!



On Thu, Jan 7, 2010 at 11:52 AM, Kelly <hurtstotouchfire at gmail.com> wrote:
> I was talking to one of the technical guys in my lab about the whole
> shared reference electrode thing.  We use Biosemi, here's their
> explanation of the implementation:
>
> http://www.biosemi.com/faq/cms&drl.htm
>
> I haven't read all the way through it yet, but I'm fascinated by the
> idea that the DRL is a passive electrode on an active cap.
>
> -Kelly
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