Summing integrator circuit?

From: Len Thomas (lenthomas102_at_aol.com)
Date: 03/11/05 

Date: Sat, 12 Mar 2005 10:35:33 +1100

I know what a summing amp and integrator are as separate circuits, but
can someone please explain the design criteria for a "summing
integrator". IOW one op amp doing both tasks.

The integrators I have used in the past have a feedback resistor in
the MegOhms and cap in parallel. If used with 10K series for each of
the several summed inputs, this would affect the gain and seemingly
limit options in this regard.

The frequencies involved are 10-40Hz, subaudio and I am looking for
unity gain. Input is 6V.

Any suggestions please?

Len