Saludos!
I've been trying to solve for the transfer function of a circuit which was proposed on my Measuring Instrumentation lecture, I have been trying all week to solve for its transfer function (which is the goal of the exercise) as a function of all the given parameters, the variable capacitor (the pressure sensor is noted as Cx. What grinds my gears is the second feedback across the R1 resistor, I don't get how it can be connected to a node which is shared with Vp, with no resistor, what is its role? I attach the circuit diagram.
Thank you in advance, Alex.