Design of current to voltage levels

[kingkarthik]

Hello all,
As a part of my project now I need to design a circuit which converts 60UA to logic 0 and 40UA to logic 1 .Please help me out.

Thanks in advance ,
Regards
Karthik

 

[smijesh]

Hi Karthik,
You can convert this current to voltage and use a voltage comparator

Set reference voltage of comparator 2V (it means 40uA source connect to ground through 50K resistor 40uA x 50K = 2V)
In this condition you can get one option below 40uA or above 40uA

 

[BigBoss]

You can also use TIA ( TransImpedance Amplifier) that is available from many manufacturer.
Look at Photodiode Amplifier for FTTH CATV networks too..You can arrange the Gain according to your requirement.

 

[crutschow]

So do you want it to stay in its previous state until it reaches the trip level?
If so, then you could use a comparator, as smijesh suggested, with a 20uA hysteresis.

What is the source impedance and voltage capability of the current signal source?