AD8202 two-stage system structure application circuit diagram

By dividing the gain into two stages, the full-scale RR signal　　from the preamplifier can be filtered at pin 3 , and the filtered half-scale signal can be restored to the full-scale signal through the output buffer amplifier . The source resistance looking into the inverting input of A2 is approximately 100 kΩ to minimize the effect of A2's input bias current.