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Switched Current source

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jonnybgood

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Attached is my simulation for a switched current source. It would be switched at 1Khz.

Simulation produced sufficient results although I had to add a 100nF cap across the switching mosfet in order to attenuate massive spikes due to fast switching time of the pulse generator.

It was set to 100ns. I would be driving the mosfet gate by a microcontroller. Do you think this solution is practical enough?

This would be the first stage of a lock-in detection circuit for a milliOhmeter.

thanks
 

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  • switched_current_source.bmp
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