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This paper describes a battery current sensor (CS) that consists of a calibrated 10mΩ shunt resistor, and a chip comprising a switched-capacitor (SC) ΔΣ ADC and a bandgap reference (BGR). The chip was realized in a standard 0.13μηι CMOS process, occupies 1.15mm2 and draws 55μΑ from a 1.5V supply. With an off-chip shunt it can digitize bi-directional currents ranging from −5A to +5A with 150μΑ offset...
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