By Stefano Salvatori & Pietro Oliva from Edn.com:
This Design Idea mates a precision current source IC with precision difference amp chips to create a programmable current source or sink.
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The resistor-programmable current source/sink in Figure 1 illustrates the basic topology, taking advantage of tightly matched on-chip resistor ratios instead of relying on absolute tolerances.
Precision programmable current source uses two ICs – [Link]
