🚀 go-pugleaf

> ah335@cleveland.Freenet.Edu (Richard Banks) writes:

> I'm building a circuit where I need high gain.  I was going to
> get two single opamps and send the output of one to the input
> of the other one.  But would it be possible for me to just get
> a dual opamp IC and send the output of one to the input of the
> other on the same chip?!  If this is possible is it a standard
> practice?

Yes this is perfectly possible, dual opamps were developed
specifically for reducing the component count and for saving
space on analogue designs.  You can treat them just like two
separate devices only they're in the same package (it saves on
decoupling capacitors too).  A couple of points to watch out for
though...You mention high gain, but don't specify whether it's at
DC, DC + AC, audio, high speed etc.  Because of the way opamps
are manufactured with on-silicon trims to reduce errors inherent
in the transistors, a single device can have more tweaks than a
dual crammed into (roughly) the same area of wafer.  This means
that, in general, a single opamp will have better spec's than the
same architecture fabricated as a dual.  Equally, a quad will be
slightly worse than a dual.  Thus if you want good DC precision
with high gain then two single OP07 devices will probably be your
best bet, especially if you're pushed for space and intend using
an 8 pin DIL, where you won't have the offset trim facility
available.

If you've got any further queries, e-mail me at the address below
(both work or so I'm told by our computer guy), this is the best
method of getting hold of me as sci.electronics tends to be quite
large and I can't guarantee to be able to read all the entries.
-- 
=================================================================
Martin Smith                             My opinions are unlikely
Mail:  smithm@eg.lucasauto.co.uk         to reflect those of this
     or smithm@liciren.li.co.uk          glorious institution....