integrators or followers

[Magnus Danielson]

From: "Grant Richter" <grichter at execpc.com>
Subject: Re: integrators or followers
Date: Sat, 5 Feb 2000 13:04:07 -0600

> > Another fully valid reason is that this is the cheapest way of getting
> > an inversion since you anyhow must buffer the output of the capacitor, so
> the
> > op-amp must be there anyhow, so just setting it up diffrently makes it do
> the
> > inversion for free.
> > 
> Bernie Hutchins always treated the inverting and non-inverting input
> of the OTA as being equivalent. He argued that the 100K to 220 ohm
> ratio was drastic enough to treat either node like a summing node.
> That means you can get either polarity from the same OTA stage using
> either input with or without an inverting stage.
> 
> I have done it both ways and it works with 3080s and 13700s.

Naturally, on a OTA you can just swap the inputs, it's easy to forget that.

Cheers,
Magnus