During the design of an ECG using an instrumentation and a differential amplifier, we can across this question:
- Comparing the one and three op-amp designs from a safety point of view: of the two designs, which provides a current path from the electrodes to the ground (and therefore are potentially dangerous)?
I know that is something related that in bioelectronics, current is dangerous. Especially, because nerves are current sources due to an exchange of ions, so allowing current to flow to ground could be dangerous without protection.
However, I am not sure how this is related 1 and 3 op-amp designs. Some of this topic was discussed in the following link (but nothing regarding safety): https://electronics.stackexchange.com/questions/91499/three-opamp-instrumentation-amplifier-vs-single-opamp-implementation#=