So I'm looking at the first picture and I'm trying to figure out now the whole shielding part of the circuit works right now. The second image is the op-amp in use (INA116). The paper mentions that it's using the guard inputs to drive the shield, which will minimize signal pickup from other sources than the signal.
I understand that the guard is a wire around a high impedance node that mades sure that other nodes don't interfere with the node. Other than that I'm completely at a loss as to what to do.
I also understand how transistors work, but if anyone could clarify how the resetting actually works on this circuit that would be great. The transistors turn on when the input voltages approach common-mode input range of the amplifier.
edit: I tried to put the two links up as images, but it wouldn't work ;-;