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Simple Precision Current Source Circuit

2015-01-10 14:16  
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The impedance of these current generators is essentially infinite for small currents and they are accurate so long as VINis much greater than VOSand IOis much greater than Ibias. The source use an FET to drive a bipolar output transistor. It is possible to use a Darlington connection in place of the FET-bipolar combination in cases where the output current is high and the base current of the Darlington input would not cause a significant error. The amplifiers used must be compensated for unity-gain and additional compensation may be required depending on load reactance and external transistor parameters. Here is a schematic drawing :

Simple Precision Current Source Circuit Simple Precision Current Source Circuit

Source Circuit : National Semiconductor Application

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