Analog Circuit Soft Fault Diagnosis Based on Sparse Random Projections and K-Nearest Neighbor

Table 1

Soft fault modes of four-opamp biquad high-pass filter.

Fault code	Fault model	Nominal value	Fault value
F1		5nF	6nF
F2		5nF	4nF
F3		5nF	6nF
F4		5nF	4nF
F5		6.2 kΩ	7.5 kΩ
F6		6.2 kΩ	5 kΩ
F7		6.2 kΩ	7.5 kΩ
F8		6.2 kΩ	5 kΩ
F9		6.2 kΩ	7.5 kΩ
F10		6.2 kΩ	5 kΩ
F11		1.6 kΩ	2 kΩ
F12		1.6 kΩ	1.2 kΩ
F13	NF	——	——