Low

A novel approach to the dynamic supply current sensing based on the measurement of voltage drop across a parasitic resistance of the supply voltage metal line is presented. Then, auto-zero technique for voltage comparator offset cancellation, which provides very accurate and sensitive low voltage measurement is proposed. Therefore, we may use this as a current monitor for dynamic current testing of mixed-signal circuits without any additional element necessarily connected in series with the power supply line. The proposed current monitor was designed in a standard 0.35µm CMOS technology. Feasibility of this approach was investigated for a wide temperature range and process variations using Monte-Carlo analysis