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OP Schematic Voltage to Current Converting ExpLog

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richi:
Hi,

i want to make Voltage to Current converting, but not linear, i need it ExpLog.

0-5V is the Control Voltage for Input to the OPV.
Output is like an LED with breakdown voltage 2-4V and its have a treshold current, example 50-200mA
Now i want the 0-5V translate it to "treshold current" -> 1A
If 0V then treshold current goes to 0mA and if  0,1V then start treshold Current and makes it exponetial function to the max values.

Any idea ?

Signal32:
I assume you didn't nt want to go the door gital route ? ADC + Micro + DAC ? Then you can do whatever you want with conversion.

richi:
Hi Signal32,

I would like to implement the purely analog, otherwise there would be time delays, and i need it up to 100kHz.
analog digital would certainly be a fine solution, but the effort would be too big, because I need the whole at least 3 times

MasterT:
Can't see a point to have 100kHz (10 usec) response time for LED.  Visual perception by human being is more than 40 milliseconds, AFAIK, though 25 Hz should be sufficient.

richi:
it's not about the LED and the viewing with the eye. I'm only interested in the analog circuit with operational amplifiers.

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