Improving Accuracy in the Readout of Resistive Sensor Arrays

Table 5

Results obtained for methods based on the ZPM by changing the size of the array and maintaining  kΩ and  Ω. (a) Classical approach. (b) ZPM 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) ZPM classical approach

Rns = 2 kΩ; Size	Error (%), (Ω)
	100	500	2000	5000	7500	10000
4 × 4	11.58	3.51	1.99	1.66	1.57	1.51
6 × 6	12.63	4.53	2.99	2.64	2.53	2.46
8 × 8	13.69	5.55	3.98	3.61	3.49	3.39
10 × 10	14.76	6.57	4.98	4.58	4.43	4.31
12 × 12	15.83	7.59	5.98	5.54	5.35	5.20
14 × 14	16.91	8.62	6.98	6.49	6.26	6.07
16 × 16	17.99	9.66	7.98	7.43	7.16	6.93

(b) ZPM-Wu

Rns = 2 kΩ; Size	Error (%), (Ω)
	100	500	2000	5000	7500	10000
4 × 4	0.75	0.74	0.73	0.70	0.68	0.66
6 × 6	1.25	1.24	1.22	1.18	1.14	1.11
8 × 8	1.74	1.74	1.70	1.64	1.58	1.53
10 × 10	2.24	2.23	2.18	2.09	2.01	1.93
12 × 12	2.74	2.72	2.65	2.52	2.41	2.30
14 × 14	3.24	3.21	3.12	2.95	2.80	2.65
16 × 16	3.73	3.70	3.59	3.36	3.17	2.98

(c) ZPM proposed method, 1st step

Rns = 2 kΩ; Size	Error (%), (Ω)
	100	500	2000	5000	7500	10000
4 × 4	0.58	0.07	0.02	0.00	0.02	0.04
6 × 6	0.70	0.13	0.06	0.03	0.01	0.01
8 × 8	0.84	0.20	0.12	0.09	0.06	0.04
10 × 10	0.99	0.29	0.20	0.16	0.13	0.10
12 × 12	1.15	0.40	0.29	0.24	0.21	0.17
14 × 14	1.33	0.52	0.40	0.33	0.29	0.25
16 × 16	1.52	0.66	0.52	0.44	0.39	0.34

(d) ZPM proposed method, 2nd step

Rns = 2 kΩ; Size	Error (%), (Ω)
	100	500	2000	5000	7500	10000
4 × 4	0.03	0.00	0.01	0.03	0.05	0.06
6 × 6	0.05	0.00	0.01	0.03	0.05	0.07
8 × 8	0.06	0.00	0.01	0.03	0.05	0.07
10 × 10	0.08	0.01	0.01	0.03	0.05	0.07
12 × 12	0.10	0.02	0.00	0.03	0.05	0.07
14 × 14	0.13	0.03	0.01	0.02	0.05	0.07
16 × 16	0.16	0.04	0.02	0.01	0.04	0.06