Journal of Sensors / 2018 / Article / Tab 4 / Research Article
Improving Accuracy in the Readout of Resistive Sensor Arrays Table 4 Results obtained for methods based on the VFM in an 8 × 8 array with different values of
if
kΩ and the resistances of the switches take different values. (a) Classical approach. (b) VFM circuit proposed by Wu et al. (c) Results for the proposed method in the first step. (d) Results for the proposed method in the second step.
(a) VFM classical approach
Rns = 5 kΩ Error (%), 100 500 2000 5000 7500 10000 1 2.31 0.69 0.39 0.34 0.33 0.32 2 4.59 1.37 0.77 0.66 0.63 0.62 4 9.19 2.74 1.53 1.30 1.24 1.22 6 13.81 4.12 2.30 1.94 1.86 1.82 9 20.78 6.19 3.45 2.90 2.77 2.71 15 34.88 10.36 5.76 4.82 4.59 4.48 20 46.79 13.88 7.69 6.42 6.11 5.94 25 58.85 17.43 9.64 8.02 7.62 7.39
(b) VFM-Wu
Rns = 5 kΩ Error (%), 100 500 2000 5000 7500 10000 1 0.74 0.07 0.22 0.25 0.25 0.25 2 0.16 0.64 0.79 0.81 0.82 0.82 4 0.98 1.76 1.90 1.93 1.93 1.93 6 2.12 2.85 2.99 3.02 3.02 3.03 9 3.83 4.47 4.59 4.62 4.63 4.63 15 7.23 7.58 7.66 7.69 7.71 7.72 20 10.05 10.07 10.09 10.12 10.15 10.18 25 12.86 12.46 12.41 12.45 12.49 12.54
(c) VFM proposed method, 1st step
Rns = 5 kΩ Error (%), 100 500 2000 5000 7500 10000 1 0.05 0.01 0.01 0.02 0.02 0.02 2 0.12 0.02 0.01 0.02 0.02 0.03 4 0.40 0.05 0.03 0.03 0.03 0.04 6 0.82 0.11 0.05 0.05 0.05 0.05 9 1.70 0.22 0.10 0.09 0.09 0.09 15 4.09 0.56 0.25 0.21 0.21 0.21 20 6.59 0.96 0.44 0.36 0.34 0.34 25 9.42 1.45 0.65 0.54 0.51 0.50
(d) VFM proposed method, 2nd step
Rns = 5 kΩ Error (%), 100 500 2000 5000 7500 10000 1 0.02 0.01 0.01 0.02 0.02 0.02 2 0.02 0.01 0.01 0.02 0.02 0.02 4 0.04 0.01 0.01 0.02 0.02 0.02 6 0.08 0.01 0.01 0.02 0.02 0.02 9 0.19 0.02 0.01 0.02 0.02 0.03 15 0.66 0.05 0.03 0.02 0.03 0.03 20 1.29 0.09 0.04 0.04 0.04 0.04 25 2.15 0.16 0.06 0.05 0.05 0.06
