[sdiy] CA3080 How to.......

[patchell]

Gm is the Transconductance.  I think Gm = Iabc * q/2kt (q :: charge of
electron, k :: boltzmans constant, and t :: temperature in degrees kelvin).

    At room temperature....ok my memory is really getting stretched here.  I
think it boils down to Gm=Iabc/0.026V at room temp.....

    Anyway, transconductance is the ratio of output current divided by input
voltage....

    I shouldn't send this, it is too late at night to think...

    Io = Gm * Vin or Io = (Iabc * Vin )/0.026.  Of course, this assumes
everything is linear.

    Here is a more detailed analysis of an OTA I did a long time ago...

http://www.oldcrows.net/~patchell/archives/ca3280_1.html

Casey J Crane wrote:

>  Hey Y'all
>
>         I was wondering if someone here know's the 3080 OTA enough
> to give me simple formulae and simplified relationships between input
> current (or voltage) and Iabc to the output current. and what is this
> gm (g sub m) constant. I'm looking at the Harris Application note # 6668.
>
> Casey
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--
 -Jim
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