[sdiy] ad844 current feedback amplifier??

[Oren Leavitt]

On 12/10/2010 1:43 PM, dan snazelle wrote:
> I have been bumping into these in some schematics.
>
> they sure are weird! can anyone fill me in on these and when they are good to use?
>
> also, if i see them in a schematic, how easy are they to replace with a regular opamp?
>
> thanks
>
>

The AD844 datasheet pretty much answers the questions.

http://www.analog.com/static/imported-files/data_sheets/AD844.pdf

Note the 50 ohm input impedance of the inverting input, and the low R 
values used to set the gain.

- Oren