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Answer by psaudocap for How to suppress current spikes in transistor feedback...
I gave up dealing with transistor capacitances and found a much easier way to solve the problem: The circuit works by a very simple feedback loop: The current through the load is measured over Rshunt...
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It's probably the MOSFET - it will have a significant drain-source capacitance and this, when you activate the switch will give you a pulse of current. You are seeing a peak current of about 15mA...
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How to suppress current spikes in transistor feedback loop
I am trying to pulse a load with a small constant current pulse (2mA @ 500us). The load does unfortunately have an unknown capacitance in the range 10nF - 1uF, parallel with an unknown resistance...
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