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questions about the instrumentation amplifiers

Question asked by keven on Dec 28, 2011
Latest reply on Dec 28, 2011 by harryh

Hi,

     all.

      I have a few questions about the instrumentation amplifiers:

      1. Are all instrumentation amplifiers based on 3-operational amplifier?

      2. What does the 'common mode voltage' in the documentations talking about amplifiers mean? Does it refers to the voltage with respect only to GND? Or does it refers to the voltage with respect to the negtive input of the amplifiers?

      Thank you!

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