current inverter

[patchell]

    This is very interesting to say the least.  I have never seen a circuit
like this, but it definately raises many posiblilies.  Thanks for bringing
our attention to this.  I am going to have to be more diligent about reading
data sheets.

    -Jim

Ian Fritz wrote:

> Hi all --
>
> Has anybody looked at using a "current inverter" circuit in place of the
> more common current mirror circuits, for example to use with an npn
> converter pair to drive OTA's? An example schematic can be found on the
> spec sheet for the Burr-Brown LOG100 log amplifier. Go to
> http://www.burr-brown.com and search for LOG100, then find Fig. 10. The
> circuit is similar to an old EN linear VCA control circuit, except with
> the transistors turned around.
>
>   Ian

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