Luis wrote...

>For years I been using the inverting OPAMP circuit when amplifying a signal,
>by using two stages to get the signal in the right phase. But Now someone
>that works with me just designed a circuit with a non inverting OPAMP
>configuration, and apart form the fact the gain can not be lower than 2 I
>can not see any problems with using this configuration. in top of it all I
>only need one OPAMP not two.
>I read a few things about it and it seems that the non inverting
>configuration puts more strain on the OPAMP...
>Do any of you have any info on this and any other problems that could arise
>by using this configuration over the inverting one.

I'm unsure what you mean when you say the non-inverting amplifier
configuration "puts more strain" on the opamp; perhaps you're
referring to input common-mode voltage effects?

If that is so, keep in mind that these effects are usually VERY
small; and unless your application is very demanding and requires
a truly EXTREME level of precision, you are unlikely to notice
them.

My advice is to use whatever amplifier configuration (inverting,
non-inverting, or differential) is most convenient in a given
application.

Dave D.

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