Inside was a simple servo, with a differential amplifier comparing the feedback via a potentiometer from the mechanism with the amplified input ... directly to the output. Instead it forms ...

By using op amps powered from a bipolar supply and ground-referencing the sensor signals, the op amp’s output will be at zero ...

The WEAOPSP18RI18RO1F22G is a rail to rail input and rail to rail output folded cascode with rail to rail output gm stage with input offset control capability. The opamp is ideal for ADC input buffers ...

with the signal conditioning and compensation circuits feeding an AD8130 differential amplifier. Another amplifier samples the output voltage and feeds it to the ADC in the microcontroller.