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Precision Current source - low current

hello,

I would like to have a current source (with load to the ground) with a low current value, between 1 and 10µA.

This current source will drive a capacitance load (around 50pF). By using analog switch , i would like to drive the load during around 100µs and after disconnect it to measure its voltage value.

Available power supply is 3.3V. Have you some ideas to realize it?

thanks

Sebastien

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