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I've isolated the noise to be EMG interference. If the subject is lying down for the measurement, still and relaxed, then there is considerably less noise than sitting. I'm getting pretty clean traces now. Example attached (unfiltered, some 50 Hz mains hum present).
I've confirmed with the scope that there is no noise beyond my sampling bandwidth. Adding two cascaded 190 Hz low pass filters with intermediate unity buffering has no noticable effect on the noise. Probing at the output from the INA128 shows a lot of noise at low frequency and beyond, much of...
There is no obvious structure to the noise as far as I can tell. Attached is a small amount of data in the silent region between beats and the corresponding FFT (Hann window, dB scale, frequency in Hz).
I have built an ECG amplifier circuit using an INA128 instrumentation amplifier with a driven right leg. The circuit is powered by two PP9 batteries for +/- 9V operation and is assembled on strip-board. This circuit suffers from a large amount of broadband noise which swamps the fine detail of...
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