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Voltage controlled current source

Question asked by davilloo on Jun 29, 2018
Latest reply on Jul 9, 2018 by ARoxas



I have to design voltage controlled current sources for a tunable laser. I have seen the "Difference Amplifier Forms Heart of Precision Current Source" article. One of the laser sections needs 150mA maximum to be delivered. I have to use the tool Red Pitaya to deliver the voltage reference, which the maximum is 1.8V. The resistance of this section, that is going to be the load resistance, is approximately 1K. I used MultiSim 14 to simulate the circuit, and it looks that the output current is not independent of load resistance. Does the AD8276 is not ideal for the application? If not, what other IC would you recommend?