[sdiy] Three-ball OTA

[KD KD]

The SSM2040 clone looks awfully similar to later CEM OTA stage
minus the Darlington driver. Moving the expo reference voltage down
should work as well.

2011/9/23, René Schmitz <uzs159 at uni-bonn.de>:

> The trouble here seems to be that the emitters of the differential pair
> are sitting near GND, if the voltage compliance of the current sink
> (i.e. standard expo current sink) is also GND. This will restrict your
> common mode voltage range on the diff pair. (all is well if you move the
> voltages up, e.g. centered around half of the positive supply.)
> Compare this to the two-ball OTAs as used in the ssm2040 clones by JH
> and myself.
>
> Cheers,
>   René
>
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