Difficult op amp circuit

Discussion in 'The Projects Forum' started by TimaV, Sep 15, 2014.

  1. TimaV

    Thread Starter New Member

    Sep 15, 2014
    2
    0
    Hello, everyone!

    I have a project design, where is an
    instrumentation amplifier. The input resistance of the circuit has to be 1M Ohm, and I have no idea how to calculate value of the resistors. I tried to google, but nothing useful was found. Can you help me with formulas?
     
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,503
    380
    hi,
    A good starting point would be to use an existing IA circuit, refer the image.

    The resistors must be close tolerance 0.1% or better if possible, use a CMOS OPA or FET input OPA.

    E
     
  3. ScottWang

    Moderator

    Aug 23, 2012
    4,855
    767
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