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Hi, In relation to fig 36, the AD705J inverts and gains the common mode voltage taken at the midpoint of the AD620 gain setting resistors. The right leg drive circuitry helps to cancel common mode signals by inverting the common mode signal and driving it back into the body. Depending upon the system architecture, the electrode located on the right leg is either driven in opposition to minimize the ac common-mode voltage swings (above), or it can be used as a reference node to measure common-mode voltage for removal digitally after conversion. A suitable amplifier would be the OP97 or OP1177 or OP2177 (where the extra op-amp can be used to buffer the common mode voltage signal (as in the AD8220 ECG circuit in Fig 6-46 in attached pdf). See also attached section from the 3rd edition of the designers guide to instrumentation amplifiers. The complete designers guide can be ordered online or from your local sales office or you can downloaded it from: <http://www.analog.com/en/content/0,2886,759%255F782%255F43643,00.html> Best Regards, Mike Mike Heffernan European Linear Support Group. ________________________________ European Central Applications Email:[email protected] <http://mail2.esiee.fr/squirrelmail/src/compose.php?send_to=euro.linear%40analog.com> Tel: Fax: +353 61 304094 ________________________________
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