On Mon, 2 Feb 2009 15:40:52 -0800, "Joel Koltner"
wrote:

"John Larkin" wrote in message
.. .
Yup. Really DC, not ~DC!

Ah, neat!

Hmm... and it's not immediately obvious to me how you get DC and AC gains to
track perfectly. Clearly you have a few tricks up your sleeve...

No trick here. Just use fast opamps!

John