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STM32F3Discovery opamp benchmarking

Question asked by blaxter.laurence.001 on Nov 2, 2012
Hi, just thought I would share these results. I've tried to benchmark F30x opamp voltage and current noise density using F3Discovery with an external feedback network connected to a Tektronics MSO4054 oscilloscope. By changing the feedback network the current and voltage noise density can be found. Unfortunately the measurement is challenging. I wouldn't trust the results at higher frequencies, and the ~100nV/sqrt(Hz) "floor" is approaching the limit of my scope sensitivity. (But I've attempted to remove the scope noise floor from the results).
F3Discovery-voltagenoise.png
F3Discovery-currentnoise.png

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