Design of a Current Sensor for I_DDQ Testing of CMOS IC

This study presents the design of an off-chip current sensor for IDDQ testing of CMOS (Complementary Metal-oxide Semiconductor) ICs (integrated circuit). It provides a linear voltage signal of I_DDQ current with a conversion factor of 5 mV/μA without any amplification. A voltage-controlled switch is used to bypass the transient current peaks. It has also been shown that the sensor is capable of detecting I_DDQ faults of a circuit at 100 kHz test frequency without degrading its performance.