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The right leg drive amp is one of the most complex aspects to deal with in ECG electronics. A large amount of analysis is required to accomplish this correctly. Shown on this slide is a representative sample of the equations involved, showing the effects of the right leg drive amp loop back to the body. One thing to note is that the more gain that is put into the right leg drive amp equates to a better CMRR, the common mode rejection ratio which is a figure of merit in front end amplifiers. The actual overall feedback loop compensates for electrode offsets that are introduced by the body electrode contact.
PTM Published on: 2012-05-08
