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current source component selection criteria

Question asked by cmbhatt76 on Jun 19, 2014
Latest reply on Jun 22, 2014 by JinoL

Hi

 

i have designed constant current source with the following value of resistors

 

R1=R2=R3=R4=10kohms

 

the resistor which decides the current, Rx=1Mohms

 

here i have attached the circuit diagram for the same.

 

input is AC voltage 500mV with a fixed frequency of 250kHz.

 

please suggest if 1Mohm is a right value for Rx or it should be limited by the Opamp IC used for the circuit. and if so which parameter i should look into?

 

thanks and with best regards

 

constant current source circuit.jpg

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