Low-noise differential amplifier circuit composed PGA203 and OPA27


Posted on Mar 28, 2007

As shown in FIG grounds PGA203 op amp OPA27 constitute a low noise differential amplifier. The circuit at the input PGA203 plus two op amps OPA27, signals from the two op amps


Low-noise differential amplifier circuit composed PGA203 and OPA27
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noninverting input terminal, using two op amps noninverting amplifier PGA203 high impedance differential input characteristics, the common mode noise rejection to Min. Gain two op amps OPA27 composed of 100, PGA203 gain 1,2,4,8, multiplying the two, so the total gain of the circuit 100,200,400,800.




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