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I am doing an EMG as a part of my senior design project. I am currently using an Instrumentation amplifier but my professor suggested using a driven right-leg circuit. I was wondering how using a right-leg circuit would make it better (what are the benefits in filtering, speed, etc)?

He also asked me the following question: What is primary drawback to leaving a patient “floating” (i.e., not connected to the same voltage reference as the op-amp amplifier)? which I don't know how to answer. I thought that it was because the voltage difference could get dangerous, but it doesn't seem plausible.

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  • \$\begingroup\$ By driving the right leg, does the voltage-difference become controlled? \$\endgroup\$ – analogsystemsrf Nov 7 '18 at 3:21
  • \$\begingroup\$ I think what you professor is hinting, is the quality of your signal. A floating patient will pick up all sorts of electrical interference (noise). Especially 50/60Hz hum from the mains grid and florescent lighting. By driving the right leg you will reduce the effect of the noise. \$\endgroup\$ – Peter Karlsen Nov 7 '18 at 8:04

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