simple precision current source circuit

Posted on Feb 6, 2014

The impedance of these current generators is essentially infinite for small currents and they are accurate so long as VIN is much greater than VOS and IO is much greater than I bias. 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 o

simple precision current source circuit
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utput 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 :

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