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In this paper, a method for maximum fault coverage with minimum power dissipation, during the testing of analog and digital circuits of mixed-signal System-on-Chip (SOC) simultaneously using Genetic Algorithm, (GA) is proposed. Mixed-signal SOC consists mainly of an analog block, a digital block and a DAC/ADC (Digital to Analog Converter/Analog to Digital Converter). Due to the presence of analog and digital circuits in mixed-signal SOCs, the testing procedure is difficult from that of only analog or digital circuit testing. Here stuck at 0/1 faults are considered for digital circuits, and stuck open/short faults are considered for analog circuits. In analog testing fault modeling, fault injection and fault simulation are done. The outputs of the analog block and some independent digital signals are given to the digital block. The GA-based approach is used for power-aware ordering of test patterns considering pattern dependency on previous patterns at the input of digital block as input patterns. The effect of noise on analog test signals has also been investigated here with the area analysis of the circuit. An average of 92.43% fault coverage and 13.56% maximum power saving is achieved when this methodology is applied to ITC 97 (Analog block) and ISCAS 85 (Digital block) benchmark circuits, respectively. A trade-off between fault coverage and power dissipation has been presented.

Power-Aware Testing for Maximum Fault Coverage in Analog and Digital Circuits Simultaneously