ac-coupled

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Discussion in 'General Electronics Chat' started by lean, Oct 16, 2004.

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  1. Oct 16, 2004 #1
    lean

    Thread Starter New Member

    Oct 15, 2004
    3
    0
    I am working with a differencial biopotencial amplifier based on two coupled buffers and a common instrumentation amplifier.

    Why must be ac-coupled the bipotential amplifiers??
     
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  2. Oct 17, 2004 #2
    beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    292
    Hi,

    That's a good question, as DC voltages at the inputs are considered common-mode, and instrumentation amps usually ignore such signals.

    Could you post the circuit so we can make more informed comments?
     
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