I am looking at building a fast and very precise current source that is variable from complete 0mA to 500mA.
I came across the application note CN-0099 from Analog Devices: http://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0099.pdf
Figure 1 shows a circuit which I have been simulating in LTSpice, but I dont understand what the point of the op-amp AD8603 is. If I just remove this opamp, the circuit still works as before.
I came across the application note CN-0099 from Analog Devices: http://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0099.pdf
Figure 1 shows a circuit which I have been simulating in LTSpice, but I dont understand what the point of the op-amp AD8603 is. If I just remove this opamp, the circuit still works as before.
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