[sdiy] PCB op-amp layout - 2x2 or 1x4

[Mattias Rickardsson]

On 30 October 2015 at 07:42,  <mskala at ansuz.sooke.bc.ca> wrote:
> On Fri, 30 Oct 2015, Mattias Rickardsson wrote:
>> For highest signal integrity, duals (or singles of course) could be
>> preferred in some cases. For example when dealing with tiny signal levels,
>
>> I still haven't had such a problem with quads though.
>
> I have oscillators that lock because they share units of a quad, despite
> my best efforts to keep them separate.  They don't lock *much*, but more
> than I would prefer, and I'm likely to redesign the board with single op
> amps instead.

Have you tried different opamp types? Some of their datasheets brag a
little bit more than others about how separated the internal power
handling is between channels, so perhaps a change of opamp is all you
need.

/mr