the ratio of vout to input voltage vin is indicative of the sum of the excitation a and b in other words addition of the first signal and the second signal as excitation a has positive y component and excitation b has a negative y component the sum of excitation a and b third signal will result in a value indicative of the excitation along the x axis now referring to fig1 b an example second sense circuit 130 2 to measure excitation along y axis is described in this example the first sensing device 108 second sensing device 110 third sensing device 118 and the fourth sensing device 120 are selectively coupled to form a wheatstone bridge configuration more specifically a first end 108 1 of the first sensing device 108 and a first end 110 1 of the second sensing device 110 are coupled together at a fifth junction 140 a first end 118 1 of the third sensing device 118 and a first end 120 1 of the fourth sensing device 120 are coupled together at a sixth junction 142 a second end 110 2 of the second sensing device 110 and a second end 118 2 of the third sensing device 118 are coupled together at a seventh junction 144 a second end 108 2 of the first sensing device 108 and a second end 120 2 of the fourth sensing device 120 are coupled.