Wavelet-Based Feature Extraction in Fault Diagnosis for Biquad High-Pass Filter Circuit

Table 1

Fault classes used on the four-op-amp biquad circuit with the specified normal and faulty component values.

Fault class	Nominal	Faulty
1↑	5 nF	10 nF
1↓	5 nF	2.5 nF
4↑	1.6 kΩ	2.5 kΩ
4↓	1.6 kΩ	500 kΩ
2↑	5 nF	15 nF
2↓	5 nF	1.5 nF
3↑	6.2 kΩ	12 kΩ
3↓	6.2 kΩ	2.7 kΩ
2↑	6.2 kΩ	18 kΩ
2↓	6.2 kΩ	2 kΩ
1↑	6.2 kΩ	15 kΩ
1↓	6.2 kΩ	3 kΩ
5, 6	5.1 kΩ	—
7, 8, 9, 10	10 kΩ	—