Please help me see the function of the op amp in the figure below, the op amp with the red arrow, thank you.
Paula 發表於 October 19, 2020
Looks a bit like single-ended variable differential?
Jerome 發表於 October 19, 2020
This is a typical circuit of the instrument amplifier AD8221. OP27 in the figure is used to set the reference voltage of AD8221. The output signal of the instrument amplifier is taken from the OUT pin and REF pin, which makes the AD8221 set up time short and improves the signal processing speed.
Mara 發表於 October 19, 2020
Look at the circuit should be the output reference voltage.
