On Mon, 12 Mar 2007 18:24:06 -0700, Jim Thompson
wrote:

On Mon, 12 Mar 2007 18:09:24 -0700, John Larkin
wrote:

On Mon, 12 Mar 2007 14:39:06 -0700, Jim Thompson
wrote:

In reply to....

From: "tiger66"
Newsgroups: sci.electronics.design
Subject: fully differential opamp implementation
Date: 10 Mar 2007 07:59:40 -0800
Organization: http://groups.google.com
Lines: 12
Message-ID: . com

See attachment.

...Jim Thompson

If the vcvs inputs were in antiparallel, and not grounded, it would
have common-mode rejection. That's just two independent, grounded
amplifiers.

John


Not the point. I was just jerry-rigging some Spice stuff to get it to
work for the OP.... with his idealistic FLOATING source.

...Jim Thompson


Will that even Spice with a floating source? With no DC path to
ground? The real-life equivalent is not knowing what the hell the cm
voltage is.

John