[sdiy] dirty/clean ground again

[Ken Stone]

I do decouple op-amps across the power rails of the device. If I decouple an
op-amp to ground as well, it is because there is a notable interaction with
ground in the circuit.

Ken

>So why do we
>all decouple opamps with dual caps to ground. Isn't it more justified to use
>single cap just across power rails? The current spikes are there only, leaving
>ground as reference voltage. With CMRR and PSRR high enough it should have no
>impact on signal even if power rails travels with respect to ground in
>semi-uncontrolled manner.
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au  
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
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