gEDA-user: analog switch idea

[kmk]

gene glick wrote:

>> Sometimes it adds linearly.  Sometimes it cancels.  Good designs 
>> will use this cancellation to advantage.
>>
> How does that work?

Take an opamp that is wired to amplify the difference of two signals. If
both signals are affected by the same noise source, the noise will be
absent in the output of the opamp.

---<(kaimartin)>---
-- 
Kai-Martin Knaak
kmk at lilalaser.de
http://lilalaser.de/blog