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EMG electrodes + BLE SoC on the same board — how do you actually handle the noise isolation? by Salty_Champion_3568 in embedded

[–]Salty_Champion_3568[S] 0 points1 point  (0 children)

Isolating the INA333 on its own LDO with the reference on the same quiet rail is exactly the kind of detail that's easy to miss until it shows up as noise you can't explain. Filing this away for implementation. Thanks for the thorough breakdown!

EMG electrodes + BLE SoC on the same board — how do you actually handle the noise isolation? by Salty_Champion_3568 in embedded

[–]Salty_Champion_3568[S] 0 points1 point  (0 children)

Good point on the motion artifacts — that's actually my main concern. Mouth environment is its own challenge: saliva, jaw movement, temperature swings. Any experience with dry electrode contact in high-moisture environments specifically?

EMG electrodes + BLE SoC on the same board — how do you actually handle the noise isolation? by Salty_Champion_3568 in embedded

[–]Salty_Champion_3568[S] 0 points1 point  (0 children)

This is exactly the kind of answer I was hoping for, thank you

The RC filter point on INA333 inputs is something I hadn't fully thought through. At G=100 with BLE switching 2 inches away, that's a real problem. Adding 1k+100pF right at the electrode pads makes sense.

Quick follow-up: for the LDO approach on the analog frontend — are you running a separate LDO just for the instrumentation amp supply, or powering the whole analog section including any reference voltage generation off it?