Maintaining the sensor biased

AN4348

18/25

DocID025166 Rev 1

If biasing is required for the sensor (e.g. an oxygen sensor), a secondary divider bridge can

be used to independently drive the input common mode voltage of the two op-amps. The

P-JFET should also be removed.

For a two electrode sensor, IC1B should be configured in follower to drive the CE to a fixed

voltage (no R5, R6 and C2 shorted).