[sdiy] current conveyor?

[Stewart Pye]

Hi David,

This is probably too obvious to be an option, but can you resign the 
integrator part of the circuit so that the + input of the op amp is at 
ground?
Alternatively return the ground pin of the 2164 to +5V and level shift 
the control circuitry and input signal.

Regards,
Stewart.


On 2/7/2012 6:47 AM, David G Dixon wrote:
> Do any gurus here know of a circuit to convey a current from a virtual
> ground point to another point at any voltage?  Essentially, I'm trying to
> feed the current output from a 2164 (which must feed to virtual ground) to
> an integrator with a voltage of -5V at its + input.  I want to convey the
> 2164's current precisely to that integrator.  I know I can convert the
> current to a voltage, and then send it back to the integrator through
> another resistor while also summing in a current from -10V through the same
> resistor.  However, notwithstanding the fact that this arrangement will also
> invert my current, input offset voltages are going to wreak havoc with
> precision.  I guess what I'm asking is, is there any way to do this without
> first converting the current to a voltage?  The current needs to be able to
> flow in both directions.  Any help most appreciated.
>
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